Sensory Disorders of the Eye and Ear - Cheat Sheet
Your rapid-fire reference guide for the most heavily tested eye and ear conditions on the NLE. Focus on differentiating acute emergencies from chronic conditions, mastering drug mechanisms, and prioritizing nursing interventions using Maslow's hierarchy and NANDA diagnoses.
ANATOMY QUICK REVIEW: Eye Structure & Function
Common values
Value
10–21 mmHg
Symbol
IOP
Quantity
Normal Intraocular Pressure
Value
2–3 microliters per minute
Symbol
Q
Quantity
Aqueous Humor Production Rate
Important facts
- Light pathway: cornea → pupil → lens → retina → optic nerve (CN II)
- Ciliary body produces aqueous humor continuously; normal IOP depends on balance between production and drainage
- The cornea provides 70% of the eye's refractive power; the lens provides adjustable focus (accommodation)
- The optic nerve carries 1.2 million axons from retinal ganglion cells; optic nerve damage in glaucoma is irreversible
- Normal vision requires intact pathway from cornea through retina to visual cortex
Key definitions
Intraocular Pressure (IOP)
Example
An IOP reading of 28 mmHg in a patient with no history of glaucoma warrants immediate investigation.
Pressure exerted by aqueous humor inside the eye; normal range 10–21 mmHg; elevated IOP causes optic nerve damage.
Aqueous Humor
Example
Impaired drainage at the trabecular meshwork is the pathophysiology of open-angle glaucoma.
Clear fluid produced by the ciliary body; nourishes the lens and cornea; drains through trabecular meshwork and canal of Schlemm.
Red Reflex
Example
A diminished or absent red reflex in an elderly patient is a classic sign of advanced cataract.
Orange-red glow seen when light reflects off the retina during ophthalmoscopy; absence suggests lens opacity (cataract) or retinal detachment.
Diagrams to know
- Sagittal cross-section of the eye showing aqueous humor production and drainage pathway
- Light refraction through the lens and focus on the retina
CATARACT: The Painless Lens Opacity
Important facts
- PAINLESS, gradual onset — patient describes glare, halos around lights, blurred vision, faded colors, difficulty reading
- Risk factors: aging, diabetes, corticosteroid use (especially systemic), trauma, UV exposure, smoking
- Examination findings: diminished red reflex, white/opaque lens on inspection, decreased visual acuity
- Treatment is ELECTIVE, scheduled when cataract interferes with daily function — not based on density alone
- Surgery is a same-day procedure; patient is awake but anesthetized
Key definitions
Cataract
Example
A 68-year-old diabetic presents with gradual vision loss, glare with night driving, and a whitish appearance in the pupil.
Opacity (clouding) of the lens that scatters light and progressively blurs vision; most common in elderly but can occur at any age.
Phacoemulsification
Example
Outpatient phacoemulsification under topical anesthesia with immediate IOL placement is the standard of care.
Surgical removal of the cataractous lens using ultrasonic energy and insertion of an intraocular lens (IOL) implant.
Diagrams to know
- Lens opacity progression: clear lens → early haze → mature cataract → hypermature (shrunken) cataract
- Cross-section showing lens opacity blocking light transmission
CATARACT SURGERY & POSTOPERATIVE CARE: The IOP-Raising Minefield
Important facts
- PRIORITY: Prevent increased IOP postoperatively — this is the #1 cause of complications and vision loss
- ABSOLUTE CONTRAINDICATIONS after surgery: bending, lifting (>5 lbs), Valsalva, coughing, sleeping on operative side
- ALWAYS wear eye shield day and night; dark glasses to reduce photophobia and glare
- Use topical antibiotic and corticosteroid drops as prescribed — prevent infection and control inflammation
- Report IMMEDIATELY: sudden severe eye pain (hemorrhage), decreased vision, increased discharge (infection), halos/blurred vision (elevated IOP)
- Slight irritation, tearing, and mild discomfort are NORMAL; severe pain is NOT and requires urgent evaluation
- Sutures, if non-dissolving, are removed in 2–4 weeks; activity restrictions last 4–6 weeks
- Vision stabilization occurs over 4–6 weeks; final refraction done after this period
Key definitions
Valsalva Maneuver
Example
Teach the patient to avoid bending at the waist, heavy lifting, and straining during bowel movements for 4–6 weeks postop.
Straining against a closed glottis (bearing down, coughing, constipation) that increases intraabdominal and intraocular pressure; FORBIDDEN after cataract surgery.
Diagrams to know
- Factors that raise IOP postoperatively: Valsalva, bending, lifting, straining, coughing, prone position
GLAUCOMA: Irreversible Optic Nerve Damage – Two Faces
Common values
Value
10–21 mmHg
Symbol
IOP
Quantity
Normal IOP Range
Value
>21 mmHg
Symbol
IOP
Quantity
Elevated IOP (Glaucoma Suspect)
Value
>24 mmHg
Symbol
IOP
Quantity
Ocular Hypertension Threshold
Important facts
- Leading cause of PREVENTABLE BLINDNESS in the Philippines and worldwide
- IOP elevation alone does NOT diagnose glaucoma; must have optic nerve damage (cupping) or visual-field loss
- Optic nerve damage is IRREVERSIBLE — once lost, vision cannot be restored; goal is to halt progression
- Vision loss is SILENT and PAINLESS in open-angle glaucoma; patients often unaware until peripheral vision is significantly lost
- Screening (tonometry, optic disc examination, visual-field testing) is the ONLY way to detect early disease
- Risk factors: age >40, family history of glaucoma, elevated IOP, African descent, diabetes, hypertension, high myopia, corticosteroid use
Key definitions
Glaucoma
Example
A 55-year-old with no symptoms is found to have IOP of 30 mmHg and early peripheral visual-field loss on screening; this is primary open-angle glaucoma.
A group of disorders with elevated intraocular pressure (IOP) that damages the optic nerve, causing progressive, IRREVERSIBLE vision loss starting peripherally.
Optic Cup
Example
A cup-to-disc ratio increasing from 0.3 to 0.7 over 2 years suggests progressive glaucomatous optic neuropathy.
Depression in the optic disc where nerve fibers exit; in glaucoma, the cup enlarges (cup-to-disc ratio increases), indicating axonal loss.
Peripheral (Tunnel) Vision Loss
Example
A patient first notices difficulty seeing objects to the side while driving or walking, but can still read fine print straight ahead.
The characteristic pattern of vision loss in glaucoma; peripheral fields narrow while central vision is preserved until late disease.
Diagrams to know
- Normal vs. glaucomatous optic disc (cupping progression)
- Visual-field defects in open-angle glaucoma (arcuate scotoma, nasal step, peripheral depression)
PRIMARY OPEN-ANGLE GLAUCOMA: The Silent Thief
Important facts
- ASYMPTOMATIC early — no pain, no red eye, no blurred vision until advanced
- GRADUAL onset — IOP rises slowly over months to years; peripheral vision lost gradually (patient often unaware)
- The phrase 'silent thief of sight' captures its insidious nature
- Peripheral vision is lost FIRST and LAST (central vision goes late); this is why patients may not notice early loss
- Diagnosis requires COMBINATION: elevated IOP + optic disc changes (cupping) + visual-field defects on perimetry
- Goldmann applanation tonometry and slit-lamp examination are standard diagnostic tools
- Regular screening every 1–2 years is recommended for all adults >40, especially high-risk groups
- Treatment is LIFELONG with topical medications; goal is to halt visual-field loss and optic nerve damage progression
Key definitions
Primary Open-Angle Glaucoma (POAG)
Example
A 62-year-old with no symptoms has an IOP of 28 mmHg, normal-appearing drainage angle on gonioscopy, but mild optic disc cupping and superior visual-field loss.
Most common type of glaucoma (~90%); drainage angle remains open but trabecular meshwork outflow resistance increases, causing gradual IOP elevation and insidious optic nerve damage.
Diagrams to know
- Cross-section of open drainage angle showing impaired aqueous outflow through trabecular meshwork
ACUTE ANGLE-CLOSURE GLAUCOMA: The Ophthalmic Emergency
Common values
Value
40–70 mmHg (often >50)
Symbol
IOP
Quantity
IOP in Acute Angle-Closure
Important facts
- ACUTE presentation with SEVERE ocular and systemic symptoms — distinguish from POAG immediately
- Classic triad: SUDDEN SEVERE eye pain + headache + vision changes (halos, blurred vision)
- Associated symptoms: red eye, corneal edema (steamy appearance), fixed MID-DILATED pupil (not fully dilated, not constricted), nausea/vomiting
- IOP is VERY HIGH (>40 mmHg), often measured in the 40–70 mmHg range
- Risk factors: angle-closure anatomy (long eyes, shallow anterior chamber, thick lens, hyperopia), pupil dilation (dim lighting, mydriatic drugs)
- MEDICAL EMERGENCY — untreated angle-closure causes BLINDNESS within 24–48 hours
- Immediate treatment: topical miotics (pilocarpine), systemic acetazolamide, osmotic agents (IV mannitol, oral glycerol), IV beta-blockers
- Definitive treatment: URGENT laser peripheral iridotomy (within hours); may need fellow eye prophylactic iridotomy
- After iridotomy, drainage angle opens, IOP normalizes, and symptoms resolve rapidly
- Prophylactic iridotomy recommended for at-risk fellow eyes to prevent acute attack
Key definitions
Acute Angle-Closure Glaucoma
Example
A 58-year-old with long-standing hyperopia presents at midnight with sudden severe left eye pain, headache, blurred vision with halos, a fixed mid-dilated pupil, and nausea/vomiting.
Ophthalmic EMERGENCY; iris suddenly blocks the drainage angle, IOP rises rapidly (often >40–60 mmHg), causing acute optic nerve ischemia and potential blindness within hours if untreated.
Laser Peripheral Iridotomy
Example
Urgent laser iridotomy in the ER prevented blindness and made the patient comfortable within hours.
Emergency procedure creating a small hole in the iris to bypass the blockage and restore aqueous drainage; prevents recurrence and is definitive treatment.
Diagrams to know
- Narrow vs. normal drainage angle anatomy showing iris blocking angle
- Mechanism of acute angle closure: pupil dilates, iris bows forward, blocks drainage angle
OPEN-ANGLE vs. ANGLE-CLOSURE GLAUCOMA: Exam Differentiator
Important facts
- This comparison is HEAVILY tested on the NLE — examiners love this distinction
- Presentation, urgency, and management differ DRAMATICALLY
- Open-angle = chronic, asymptomatic, regular screening, topical drugs, laser trabeculoplasty, filtration surgery
- Angle-closure = acute, symptomatic emergency, immediate treatment, urgent laser iridotomy
GLAUCOMA MEDICATIONS: Mechanisms & Nursing Priorities
Important facts
- Glaucoma drops LOWER IOP and are taken LIFELONG; skipping doses risks vision loss
- FIRST-LINE: Prostaglandin analogs — latanoprost, travoprost, bimatoprost (increase aqueous outflow)
- SIDE EFFECTS of prostaglandin analogs: iris darkening (permanent), eyelash growth/darkening, conjunctival hyperemia
- BETA-BLOCKERS (timolol, betaxolol): decrease aqueous production; use punctal occlusion and monitor for systemic beta-blockade
- ABSOLUTE CONTRAINDICATION of non-selective beta-blockers: asthma, COPD, bradycardia, heart block, hypotension
- ALPHA-2 AGONISTS (brimonidine, apraclonidine): reduce aqueous production and increase uveoscleral outflow; local allergy common
- CARBONIC ANHYDRASE INHIBITORS: dorzolamide (topical), acetazolamide (systemic) — decrease aqueous production; acetazolamide causes metabolic acidosis, paresthesias
- CHOLINERGIC MIOTICS (pilocarpine): constrict pupils to open drainage angle — especially useful in angle-closure; causes headache, accommodation spasm
- RHOKINASE INHIBITORS (netarsudil): newer class; increase conventional and uveoscleral outflow; conjunctival hyperemia common
- COMBINATION DROPS: many 2-drug combinations available; check compatibility before mixing separate drops
- INSTILLATION TECHNIQUE: 5-minute interval between different drugs; instill suspensions/ointments last
Key definitions
Punctal Occlusion
Example
When giving timolol to a patient with asthma, teach punctal occlusion to minimize systemic beta-blockade and bronchoconstriction risk.
Gentle pressure on the medial canthus (inner corner) for 1–2 minutes after instilling eye drops to block nasolacrimal drainage and increase local ocular drug concentration while reducing systemic absorption.
Diagrams to know
- Aqueous humor pathways: conventional (trabecular meshwork) vs. uveoscleral; which drugs target which pathway
RETINAL DETACHMENT: The Urgent Surgical Emergency
Important facts
- PAINLESS — retina has no pain fibers; patient feels NO pain despite urgent pathology
- Classic presentation triad: SUDDEN floaters + FLASHES of light + CURTAIN/SHADOW spreading across visual field
- The 'curtain' or 'shadow' corresponds to the area of detached retina; progresses toward center if untreated
- Visual loss is PROGRESSIVE but PAINLESS — patient may ignore early symptoms until vision is significantly affected
- Risk factors: high myopia, prior eye surgery, vitreous traction, family history, trauma, diabetic retinopathy, retinopathy of prematurity
- Acute, sudden onset is common; some detachments are slowly progressive (chronic traction detachments)
- Diagnosis: dilated fundus examination by ophthalmologist; ultrasound if media opacity prevents visualization
- URGENT SURGICAL REPAIR required to restore vision — delay results in permanent vision loss
- Types of repair: scleral buckling (external), pneumatic retinopexy (gas bubble), vitrectomy with endolaser or cryotherapy
Key definitions
Retinal Detachment
Example
A 55-year-old with high myopia and prior eye surgery develops sudden floaters and a shadow creeping in from the periphery; retinal detachment is confirmed on dilated fundus exam.
Separation of the neurosensory retina from the underlying retinal pigmented epithelium (RPE), cutting off its blood and oxygen supply; causes painless, progressive vision loss.
Photopsia
Example
A patient reports seeing 'lightning bolts' in the outer vision field, especially on eye movement — this warrants urgent retinal evaluation.
Flashes of light (lightning streaks) in the visual field, often at the periphery; classic warning sign of vitreous traction on the retina.
Floaters
Example
Sudden onset of many new floaters in one eye suggests vitreous hemorrhage from retinal break or detachment.
Spots, threads, or cobweb-like shadows in the visual field caused by vitreous opacities or blood; sudden INCREASED floaters are a red flag for retinal detachment.
Macula
Example
A macula-sparing retinal detachment has better visual outcomes than macula-off detachment.
Central 2 mm of the retina responsible for sharp, detailed central vision; if detached, visual prognosis is worse.
Diagrams to know
- Cross-section showing detached retina separated from underlying RPE and choroid
- Progress of detachment from peripheral break toward central macula
RETINAL DETACHMENT SURGERY: Position & Precautions
Important facts
- Preoperative: restrict activity as ordered; position head/body to keep detached area in dependent position to prevent further detachment
- Postoperative with GAS BUBBLE: MANDATORY head positioning (often face-down or head-in-specific direction) for weeks; gas is gradually absorbed
- CANNOT fly or travel to high altitude with gas bubble in eye — pressure changes cause dangerous expansion
- CANNOT use air-filled contacts after gas injection until gas completely resorbed (check with ophthalmologist)
- Vision is blurred initially but improves as gas is absorbed and replaced with natural aqueous humor
- Postoperative pain control is important; patient will experience discomfort with prolonged positioning
- Teach specific positioning exercises and monitor compliance — proper positioning is critical to surgical success
- Report immediately: sudden vision loss, severe pain, floaters/flashes (recurrent detachment), discharge/redness (infection)
- Activity restrictions (no lifting, straining, bending) last 4–6 weeks as with cataract surgery
- Final visual acuity depends on whether macula was detached and duration of detachment before repair
Key definitions
Gas Bubble (Pneumatic Tamponade)
Example
After vitrectomy with gas injection, the patient must maintain head-down position for 2 weeks so the bubble acts as an internal splint.
Expandable gas bubble (SF6, C3F8) injected into the vitreous to mechanically push the detached retina back onto the underlying tissue while laser or cryotherapy seals the retinal break.
Scleral Buckling
Example
A buckle procedure is often combined with laser or cryotherapy to seal retinal breaks.
External surgical procedure placing a silicone band around the sclera to indent the eye wall inward, relieving vitreous traction and reattaching the retina.
Diagrams to know
- Gas bubble positioning as internal splint; mandatory head positioning to maintain tamponade
OTITIS EXTERNA: Swimmer's Ear
Important facts
- Causes: water in ear canal, ear-canal trauma (cotton swabs, fingernails, hearing aids), bacterial or fungal infection, dermatitis
- Most common organisms: Pseudomonas aeruginosa, Staphylococcus aureus, fungi (Aspergillus, Candida)
- Presentation: ear pain (often severe), worse with jaw movement or auricle manipulation, itching, drainage (serous, purulent, or hemorrhagic), temporary hearing loss if canal is swollen
- Examination: swollen, erythematous canal; may see exudate or debris
- Treatment: topical antibiotic/steroid drops (neomycin-polymyxin B-hydrocortisone, fluoroquinolone drops); oral antibiotics if systemic infection
- Prevention/teaching: keep ears dry after swimming (alcohol or vinegar drops, dry cotton), avoid insertion of foreign objects, do not pick at ears
Key definitions
Otitis Externa
Example
A swimmer presents with severe ear pain worsened by pulling the auricle, itching, and serosanguineous drainage.
Inflammation or infection of the outer ear canal (external auditory meatus); commonly caused by water exposure, trauma, or poor hygiene.
OTITIS MEDIA: Middle-Ear Infection in Children
Important facts
- Most common in children <3 years because Eustachian tubes are shorter, more horizontal, narrower, and more compliant
- Viral URI precedes bacterial infection; fluid accumulation causes pain and temporary hearing loss
- Organisms: Streptococcus pneumoniae, Haemophilus influenzae type b, Moraxella catarrhalis, Group A Streptococcus
- Acute otitis media (AOM): ear pain, fever, bulging erythematous TM, possible perforation with drainage
- Otitis media with effusion (OME): fluid behind TM without acute infection; asymptomatic or mild hearing loss; may persist weeks after AOM
- Treatment: analgesics (acetaminophen, ibuprofen), antibiotics if bacterial (amoxicillin first-line), nasal decongestants
- Spontaneous perforation relieves pain and drains pus but risks chronic suppurative otitis and conductive hearing loss
- Tympanostomy tubes indicated for: recurrent AOM (≥4 in 6 months), persistent OME >3 months with hearing loss, recurrent AOM with OME
- Teaching: complete full course of antibiotics, warm compress for pain, keep ear dry if TM is perforated, prevent water entry if tubes present
Key definitions
Otitis Media
Example
A 2-year-old with URI symptoms develops acute ear pain, fever (39°C), and a bulging, erythematous tympanic membrane on otoscopy.
Inflammation or infection of the middle ear (tympanic cavity), most common in children ages 6 months to 3 years; caused by viral upper-respiratory infection or bacterial pathogens.
Eustachian Tube
Example
A child's Eustachian tube is 17 mm long and at a 10° angle; an adult's is 36 mm long and at a 45° angle — this explains why otitis media is more common in children.
Canal connecting the middle ear to the nasopharynx; in children, it is shorter, more horizontal, and narrower, predisposing to fluid trapping and infection.
Tympanostomy Tubes
Example
A child with 4+ episodes of otitis media in 6 months and persistent fluid on audiometry is a candidate for tube placement.
Small tubes inserted through the tympanic membrane (myringotomy) to allow middle-ear drainage and ventilation; used for recurrent otitis media with effusion.
Diagrams to know
- Eustachian tube anatomy: child vs. adult — angle and length differences
MÉNIÈRE'S DISEASE: The Triad of Terror
Important facts
- Classic TRIAD: (1) EPISODIC VERTIGO (sudden, severe, spinning, unpredictable), (2) TINNITUS (ringing/roaring, often low-frequency), (3) FLUCTUATING SENSORINEURAL HEARING LOSS
- Fourth symptom often present: aural fullness (pressure sensation in the affected ear)
- Vertigo attacks last MINUTES to HOURS (typically 20 minutes to 2 hours); nausea and vomiting often accompany vertigo
- Hearing loss FLUCTUATES early in disease but may become permanent if disease progresses
- PATHOPHYSIOLOGY: Excess endolymph distends the membranous labyrinth, disrupting vestibular and cochlear function
- Etiology is unclear but may be related to: osmotic imbalance, fluid metabolism disorder, viral infection, autoimmune mechanism
- Typically UNILATERAL (one ear affected) but can become bilateral in 10–15% of cases
- Diagnosed by: history, audiometry (low-frequency sensorineural loss), caloric testing (vestibular dysfunction), MRI to rule out other pathology
- Onset typically ages 20–50 years; onset after age 60 is unusual and warrants investigation for other causes
- UNPREDICTABLE attacks make daily life extremely difficult; patients fear sudden onset while driving or at work
Key definitions
Ménière's Disease
Example
A 45-year-old woman experiences sudden onset spinning vertigo lasting 20 minutes, ringing in the ear, temporary hearing loss, and a feeling of fullness in the left ear; episodes are unpredictable.
Inner-ear disorder caused by abnormal buildup of endolymph (endolymphatic hydrops); produces episodic VERTIGO, TINNITUS, and FLUCTUATING SENSORINEURAL HEARING LOSS.
Vertigo
Example
Vertigo is so severe during a Ménière's attack that the patient cannot walk and must lie perfectly still in a dark room.
Sensation that the room is spinning (true vertigo) or that the patient is spinning; caused by vestibular dysfunction; different from dizziness or lightheadedness.
Tinnitus
Example
A patient describes hearing a loud roaring sound like rushing water in the affected ear, especially during vertigo episodes.
Ringing, buzzing, hissing, or roaring sound in the ear with no external source; in Ménière's, typically low-frequency and often louder during attacks.
Endolymphatic Hydrops
Example
Endolymphatic hydrops disrupts normal vestibular and cochlear function, producing the characteristic symptoms of Ménière's disease.
Excessive accumulation of endolymph in the membranous labyrinth of the inner ear, causing bulging of Reissner's membrane and pressure on sensory hair cells.
Diagrams to know
- Inner-ear anatomy showing cochlea, vestibule, semicircular canals, and membranous labyrinth with endolymph
- Effect of endolymphatic hydrops on Reissner's membrane and sensory cells
MÉNIÈRE'S DISEASE MANAGEMENT: Medical & Lifestyle
Common values
Value
<2000 mg/day
Symbol
Na
Quantity
Recommended Daily Sodium Intake for Ménière's
Important facts
- PRIORITY during acute attack: SAFETY FIRST — prevent falls and injury from severe vertigo
- Acute attack management: bed rest in quiet, darkened room; patient remains still (any head movement worsens vertigo)
- Medications for acute vertigo: vestibular suppressants (meclizine), antiemetics (metoclopramide, prochlorperazine), anticholinergics (scopolamine)
- Chronic management: LOW-SODIUM DIET (<2 g/day) — reduces fluid retention and endolymphatic volume
- Diuretics (thiazide, loop diuretics) help some patients by promoting fluid loss
- Avoid TRIGGERS: caffeine, alcohol, nicotine — all can worsen symptoms by affecting inner-ear fluid balance
- Vestibular rehabilitation exercises may help reduce vertigo with time and improve balance
- Hearing aids if hearing loss is significant
- If medical management fails, surgical options: endolymphatic sac surgery, labyrinthectomy (destroys vestibular function), or vestibular nerve section
- Teaching: avoid sudden head movements, change positions slowly, do not drive during attacks, use assistive devices if balance is affected
- Psychological support important — chronic unpredictable vertigo causes anxiety and depression; counseling and support groups helpful
Key definitions
Sodium Restriction
Example
A patient with Ménière's is counseled to avoid processed foods, canned goods, and added salt; this simple dietary change reduces attack frequency in ~50% of patients.
Limiting dietary salt intake (typically <2 g/day) to reduce fluid retention and decrease endolymphatic volume in Ménière's disease.
Diagrams to know
- Pathophysiology loop: increased endolymph → increased pressure → hair cell dysfunction → vertigo, tinnitus, hearing loss
HEARING LOSS: Conductive vs. Sensorineural
Important facts
- Conductive loss: problem is BEFORE the inner ear (outer/middle ear); sound is present but not transmitted
- Sensorineural loss: problem is IN/AFTER the inner ear (cochlea/CN VIII); sound transmission is intact but perception is damaged
- Conductive causes: cerumen impaction, otitis media/effusion, perforated TM, otosclerosis, cholesteatoma, malleus/incus/stapes fixation
- Sensorineural causes: aging (presbycusis), noise exposure, ototoxic drugs, viral infections (measles, mumps, rubella), meningitis, head trauma, acoustic neuroma, Ménière's disease, sudden sensorineural hearing loss (SSNHL)
- Weber TEST INTERPRETATION: normally heard equally; lateralizes to WORSE ear in CONDUCTIVE loss; lateralizes AWAY from WORSE ear in SENSORINEURAL loss
- Rinne TEST INTERPRETATION: normal is AC > BC (air conduction louder); in CONDUCTIVE loss, BC > AC (bone conduction louder)
- Combined conductive and sensorineural loss ('mixed' loss) also occurs
- Audiometry (pure-tone and speech audiometry) is gold standard for documenting type and degree of loss
- Conductive loss is often correctable: remove cerumen, treat otitis media, surgical repair (ossiculoplasty, stapes surgery)
- Sensorineural loss is usually permanent; management focuses on amplification (hearing aids), cochlear implants for severe loss, and communication strategies
Key definitions
Conductive Hearing Loss
Example
Cerumen impaction blocking the ear canal, otitis media with fluid, or otosclerosis causing stapes fixation — all produce conductive loss.
Hearing impairment due to a problem in the OUTER or MIDDLE EAR blocking sound transmission; often reversible or correctable.
Sensorineural Hearing Loss
Example
Age-related presbycusis, noise-induced hearing loss, ototoxic drugs, viral labyrinthitis, acoustic neuroma — all cause sensorineural loss.
Hearing impairment due to damage to the INNER EAR (cochlea) or AUDITORY NERVE (CN VIII); usually permanent and irreversible.
Presbycusis
Example
An 70-year-old has difficulty hearing high-pitched sounds (consonants) and finds conversation in noisy environments particularly challenging.
Age-related sensorineural hearing loss; typically bilateral, high-frequency loss; begins in 40s–50s and progresses with age.
Weber Test
Example
Weber test lateralizes to the left ear — suggests left-sided conductive loss (sound lateralizes to bad ear in conductive loss) or right-sided sensorineural loss (sound lateralizes away from bad ear).
Tuning-fork test for hearing asymmetry; fork is placed on midline of forehead; normally sound is heard equally in both ears; lateralization to one ear suggests unilateral loss.
Rinne Test
Example
In conductive loss, the Rinne test shows bone conduction louder than air conduction on the affected side — the reverse of normal.
Tuning-fork test comparing air conduction (AC) to bone conduction (BC); normal is AC > BC; BC > AC suggests conductive loss.
Diagrams to know
- Sound pathway: external ear → tympanic membrane → ossicles → oval window → cochlea → CN VIII → auditory cortex
- Weber and Rinne test interpretation flowchart
OTOTOXIC MEDICATIONS: Hearing Loss & Tinnitus Risk
Important facts
- Aminoglycosides (gentamicin, tobramycin, amikacin): HIGH OTOTOXICITY — dose-dependent and cumulative; monitor serum levels; check baseline hearing before starting
- Loop diuretics (furosemide, bumetanide): ototoxic especially in HIGH DOSES or with renal impairment; risk increases when combined with aminoglycosides ('synergistic')
- High-dose aspirin and NSAIDs (salicylates): reversible tinnitus and hearing loss; typically high-frequency loss; resolves after drug discontinuation
- Chemotherapy agents (cisplatin, carboplatin): severe irreversible ototoxicity; high-frequency sensorineural loss; cumulative dose-dependent
- Macrolide antibiotics (azithromycin, erythromycin): less common but possible ototoxicity
- Vancomycin: possible ototoxicity, especially with high trough levels or renal impairment
- RISK FACTORS for ototoxicity: high drug dose, prolonged duration, renal impairment, dehydration, age >60, baseline hearing loss, concomitant ototoxic drugs, liver disease
- SYNERGISTIC EFFECT: combining multiple ototoxic drugs (e.g., gentamicin + furosemide + NSAIDs) increases risk dramatically
- Early signs: tinnitus (ringing/buzzing), high-frequency hearing loss, difficulty hearing consonants in conversation
- Baseline and periodic audiometry recommended for patients on known ototoxic drugs; discontinue if hearing loss develops
- Prevention: use lowest effective dose, monitor serum drug levels, maintain adequate hydration, avoid nephrotoxic combinations, educate patients about symptoms
Key definitions
Ototoxicity
Example
A patient on gentamicin for 2 weeks develops tinnitus and high-frequency hearing loss; these are early signs of aminoglycoside ototoxicity.
Damage to the inner ear (cochlea or vestibule) or CN VIII caused by medications, resulting in hearing loss and/or vertigo; often irreversible.
Diagrams to know
- Common ototoxic drugs by category and risk level
SUDDEN SENSORINEURAL HEARING LOSS (SSNHL): Medical Emergency
Important facts
- Defined as loss of ≥30 dB in ≥3 consecutive frequencies over ≤3 days
- UNILATERAL in >90% of cases; bilateral SSNHL is rare and suggests systemic disease
- Incidence: ~2–5 per 10,000 per year in the Philippines and worldwide
- Possible etiologies: viral infection (labyrinthitis), vascular insufficiency, autoimmune inner-ear disease, trauma, neoplasm (acoustic neuroma), idiopathic (~70%)
- Urgent evaluation: audiometry, MRI to rule out acoustic neuroma or other pathology, CBC, metabolic panel, serologies
- Prognosis: ~50% recover spontaneously; early treatment improves outcomes
- Treatment (controversial but widely used): systemic corticosteroids (oral prednisone or IV methylprednisolone) — most effective if started within 2 weeks
- Intratympanic corticosteroid injections used as salvage therapy
- Antiviral therapy (acyclovir, valacyclovir) sometimes used if viral etiology suspected
- Patient education: this is a medical emergency; seek evaluation immediately; prognosis depends on early treatment
Key definitions
Sudden Sensorineural Hearing Loss (SSNHL)
Example
A 45-year-old awakens with sudden complete hearing loss in the right ear; audiometry confirms sensorineural loss; urgent MRI and corticosteroids are initiated.
Abrupt loss of sensorineural hearing (30 dB at 3 contiguous frequencies) occurring over hours to days, unilateral; medical emergency requiring urgent evaluation and treatment.
COMMUNICATION WITH HEARING-IMPAIRED PATIENTS
Important facts
- FACE THE PATIENT — position yourself directly in front, at eye level; do not speak from behind or to the side
- Speak CLEARLY and at NORMAL PACE — do not shout (distorts speech) or speak too slowly
- Use a LOWER PITCH — high-pitched voices are harder to hear in sensorineural loss (especially presbycusis)
- REDUCE BACKGROUND NOISE — move to a quiet area if possible; background talking/music makes hearing aid use less effective
- Use WRITTEN COMMUNICATION if verbal is ineffective — written notes, phone text, email
- USE VISUAL AIDS — demonstrate, draw pictures, use hand gestures to clarify
- Ensure HEARING AID is functioning — check battery, proper fitting, volume setting
- Allow extra TIME for communication — be patient; do not rush
- REPEAT using different words if patient does not understand — rephrase rather than repeat the exact same phrase
- Verify understanding by asking patient to REPEAT back important instructions (teach-back method)
- Involve FAMILY or CAREGIVERS if available to assist with communication
- Use PROFESSIONAL INTERPRETERS or TTY/videophone services if available in healthcare setting
Key definitions
Lip Reading
Example
When speaking with a hearing-impaired patient, position yourself at eye level, maintain good lighting on your face, and speak clearly.
Visual interpretation of spoken words by watching the speaker's lips and facial expressions; used by many hard-of-hearing individuals.
EYE DROP INSTILLATION TECHNIQUE: Perfect Practice
Common values
Value
7–8 microliters
Symbol
Volume
Quantity
Conjunctival Sac Capacity
Important facts
- CLEAN HANDS thoroughly before instillation — prevent infection
- Tilt HEAD BACK and pull DOWN LOWER LID to form a small pocket
- Instill DROP into the CONJUNCTIVAL SAC (not directly on cornea, not on lid margin)
- Do NOT touch the DROPPER TIP to the eye or lid (contamination risk)
- Close EYE gently (do not squeeze) and hold for 1–2 minutes to allow absorption
- PUNCTAL OCCLUSION: Press gently on the medial canthus (tear duct area) for 1–2 minutes after instillation to block nasolacrimal drainage and reduce systemic absorption
- If MULTIPLE DROPS are ordered, wait 5 MINUTES between different medications to allow absorption and avoid wash-out
- Install SUSPENSIONS or OINTMENTS LAST (after liquid drops) — these are thicker and may block absorption of other drops
- OINTMENTS: instill a ribbon ~1/4 inch in the lower conjunctival sac; blurred vision is expected; use at bedtime
- Avoid rubbing the eye — removes medication and may cause irritation
- If drop misses the eye, do NOT re-instill immediately — wait until next scheduled time
- Reusable dropper bottles: cleanliness essential; single-use droppers safer
Key definitions
Conjunctival Sac
Example
Gently pull down the lower lid to form a pocket and instill the drop into this space, not directly on the cornea.
Space between the eyeball and eyelid where medication is placed; has a capacity of ~7–8 microliters.
Diagrams to know
- Step-by-step diagram of proper eye-drop instillation technique
SAFE ENVIRONMENT FOR VISUALLY IMPAIRED PATIENTS
Important facts
- ANNOUNCE YOUR PRESENCE — identify yourself by name and role before approaching the patient
- ORIENT the patient to the environment — describe room layout, location of bathroom, call bell, personal belongings
- Keep ENVIRONMENT SAFE and CLUTTER-FREE — remove obstacles, trailing cables, furniture in walkways; risk of falls is HIGH
- CONSISTENT PLACEMENT of personal items — bedside table, chair, bathroom — so patient can locate them independently
- Provide VERBAL CUES for navigation — 'bed is to your right,' 'three steps to the bathroom'
- Use HANDRAILS and GUIDANCE when ambulating — hold the patient's arm; do not grab and pull
- Offer an ARM or ELBOW for guiding during ambulation — do not grab or push
- LIGHTING appropriate to condition — brighter for those with residual vision, softer for photophobia (post-cataract surgery)
- Keep CALL BELL within REACH and ensure patient knows how to use it
- Use VERBAL DESCRIPTION of procedures — explain what you are about to do and why; do not assume the patient can see your actions
- LABEL items clearly in the room if patient has some vision — use large print or Braille
- Provide AUDIO MATERIALS — radio, audiobooks, talking clock, apps for blind users (JAWS, NVDA)
- ORIENT family members to assist with patient safety and independence
- Assess MOBILITY and VISION with patient to determine safe ambulation; use assistive devices (cane, walker) as needed
Must remember
Exam tip
An elderly patient with blurred vision, glare, and halos—NOT pain—describes cataract. Post-op priorities are IOP precautions: no bending, lifting, straining, Valsalva, coughing; wear shield; use drops; report sudden severe pain immediately.
Why tested
Most common lens disorder; easily confused with glaucoma; treatment is elective surgery when interferes with function, NOT based on density alone
Critical concept
CATARACT = PAINLESS, GRADUAL LENS OPACITY
Exam tip
Memorize: elevated IOP alone does NOT diagnose glaucoma; must have optic nerve cupping OR visual-field loss. Vision loss starts PERIPHERALLY (tunnel vision) and goes to CENTER last. Screening is ESSENTIAL because early disease is asymptomatic.
Why tested
Leading preventable cause of blindness; examiners test understanding that damage is IRREVERSIBLE and goal is to HALT PROGRESSION, not restore vision
Critical concept
GLAUCOMA = IRREVERSIBLE OPTIC NERVE DAMAGE from elevated IOP; VISION LOSS IS PERMANENT
Exam tip
If you see 'SUDDEN SEVERE EYE PAIN + FIXED MID-DILATED PUPIL + HALOS + NAUSEA/VOMITING' — that is ACUTE ANGLE-CLOSURE glaucoma (ophthalmic emergency). Treatment: urgent medications + emergency laser iridotomy. If gradual, asymptomatic peripheral vision loss → open-angle glaucoma (chronic topical medications).
Why tested
Most heavily tested distinction on NLE; opposite presentations, opposite urgency, opposite treatments
Critical concept
OPEN-ANGLE GLAUCOMA: painless, gradual, asymptomatic early; ANGLE-CLOSURE GLAUCOMA: EMERGENCY with sudden severe pain, halos, fixed mid-dilated pupil, nausea/vomiting
Exam tip
For beta-blockers (timolol): TEACH PUNCTAL OCCLUSION (press medial canthus 1–2 minutes) to reduce systemic absorption and systemic side effects. Contraindicated in asthma, COPD, bradycardia. Prostaglandin analogs cause permanent iris darkening and eyelash growth.
Why tested
Common patient teaching point; medication adherence is the difference between vision preservation and blindness
Critical concept
GLAUCOMA MEDICATIONS are LIFELONG; patient must take on schedule to preserve remaining vision; NEVER stop abruptly
Exam tip
Red flag: sudden increase in floaters + flashes + visual-field shadow = retinal detachment until proven otherwise. Teach patient: restrict activity pre-op; after gas bubble surgery, MAINTAIN SPECIFIC HEAD POSITION (e.g., face-down) for weeks; CANNOT fly or go to high altitude while gas bubble present.
Why tested
Time-critical condition; delay causes permanent vision loss; nursing priority is safe positioning and preventing further detachment pre-op and maintaining prescribed head position (often face-down) post-op with gas bubble
Critical concept
RETINAL DETACHMENT: SUDDEN floaters + FLASHES of light + CURTAIN/SHADOW spreading across visual field, PAINLESS; URGENT SURGICAL EMERGENCY
Exam tip
Priority during vertigo attack: SAFETY FIRST—patient lies still in quiet, dark room; prevent falls. Chronic management: LOW-SODIUM DIET (<2 g/day) + diuretics + avoid caffeine, alcohol, nicotine. Vestibular rehabilitation exercises help over time.
Why tested
Classic presentation that examiners test; easily confused with other vertigo causes; treatment includes low-sodium diet, diuretics, vestibular suppressants
Critical concept
MÉNIÈRE'S DISEASE = TRIAD: EPISODIC VERTIGO (sudden, severe spinning) + TINNITUS (ringing) + FLUCTUATING SENSORINEURAL HEARING LOSS; often with aural fullness
Exam tip
Teaching point: Complete antibiotics; keep water out of ears if tubes present; prevent water entry. Recurrent otitis media (≥4 episodes in 6 months) or persistent OME (>3 months with hearing loss) = candidate for myringotomy and tympanostomy tube placement.
Why tested
Explains the epidemiology and anatomy; why recurrent cases need tympanostomy tubes
Critical concept
OTITIS MEDIA most common in CHILDREN <3 years because Eustachian tube is SHORTER, MORE HORIZONTAL, NARROWER than in adults
Exam tip
When aminoglycosides are used: check baseline hearing; monitor serum levels (peak/trough); educate patient about tinnitus/hearing loss symptoms. SYNERGISTIC EFFECT: combining multiple ototoxic drugs (e.g., gentamicin + furosemide) increases risk dramatically. If hearing loss develops, consider discontinuing or substituting alternative drug.
Why tested
Patient safety; nurses must monitor and report early signs (tinnitus, high-frequency hearing loss) to prevent permanent damage
Critical concept
OTOTOXIC MEDICATIONS include aminoglycosides (gentamicin), loop diuretics (furosemide), high-dose aspirin/salicylates, and chemotherapy (cisplatin); cause irreversible hearing loss and tinnitus
Exam tip
Weber lateralizes to WORSE ear in conductive loss (sound goes to plugged ear). Rinne shows BC > AC in conductive loss (bone pathway opens while air pathway blocked). In sensorineural, both AC and BC are decreased but AC still > BC (same pattern as normal, but reduced).
Why tested
Tuning-fork tests are on most exams; must be able to interpret them to differentiate types of hearing loss
Critical concept
WEBER TEST INTERPRETATION: lateralizes TO affected ear in CONDUCTIVE loss; lateralizes AWAY FROM affected ear in SENSORINEURAL loss. RINNE TEST: AC > BC (normal); BC > AC in CONDUCTIVE loss
Exam tip
Common mistakes: instilling drop directly on cornea (uncomfortable, loss of drop), not occluding punctum (systemic absorption/side effects), not waiting between drops (wash-out), not closing eye gently (loss of drop). Teach patients this technique for home use.
Why tested
Fundamental nursing skill; proper technique ensures medication efficacy and prevents complications
Critical concept
SAFE EYE DROP INSTILLATION TECHNIQUE: wash hands, tilt head back, pull down lower lid to form pocket, instill drop (not on cornea), close eye gently, PUNCTAL OCCLUSION 1–2 minutes; wait 5 minutes between different drops; suspend/ointment LAST
Last minute tips
ACUTE ANGLE-CLOSURE GLAUCOMA is an OPHTHALMIC EMERGENCY—if you see 'SUDDEN SEVERE EYE PAIN + FIXED MID-DILATED PUPIL + HALOS + NAUSEA/VOMITING,' answer IMMEDIATELY with 'urgent laser iridotomy' and 'lie patient down.' This is one of the few 'treat-right-now' conditions in ophthalmology on the NLE.
Context
Examiners test your ability to recognize emergencies and prioritize.
GLAUCOMA MEDICATIONS are lifelong and must be taken on SCHEDULE. Emphasize this in teaching—the patient's vision depends on adherence. NEVER tell a patient 'take as needed' for glaucoma drops; they are preventative, not curative.
Context
Medication teaching is heavily tested; this distinction is critical for patient safety.
RETINAL DETACHMENT postoperatively: if a GAS BUBBLE is used, the patient CANNOT fly or go to HIGH ALTITUDE until the gas resorbs. This is a mandatory, non-negotiable teaching point—air pressure changes can cause dangerous bubble expansion.
Context
Specific post-op precaution that examiners include in scenario questions.
WEBER and RINNE tuning-fork tests are exam favorites. Memorize: Weber lateralizes to the WORSE ear in conductive loss (sound goes to plugged ear); Rinne shows BC > AC in conductive loss (bone pathway opens while air pathway blocked). Use this mnemonic: 'Conductive loss = sound goes to the bad ear (Weber) and bone beats air (Rinne)'.
Context
Quick tuning-fork reference for differentiation questions.
MÉNIÈRE'S DISEASE teaching: LOW-SODIUM DIET (<2 g/day) + DIURETICS + avoid CAFFEINE, ALCOHOL, NICOTINE. These are the pillars of chronic management. Acute attack = safety, dark room, stillness, vestibular suppressants. Examiners love asking about both acute and chronic management.
Context
Comprehensive management is testable; diet is often overlooked by students.
Comparison tables
PRIMARY OPEN-ANGLE vs. ACUTE ANGLE-CLOSURE GLAUCOMA: The Critical Distinction
| Feature | Open-Angle Glaucoma | Acute Angle-Closure Glaucoma |
|---|---|---|
| Onset | Gradual, insidious; months to years | Sudden, dramatic; minutes to hours |
| Symptoms | NONE early; painless; asymptomatic (silent thief of sight) | SEVERE ocular pain, headache, nausea/vomiting, vision change |
| Eye Appearance | Appears normal; no redness, no corneal changes | RED eye, corneal edema (steamy), pupil mid-dilated and FIXED |
| IOP Level | Mildly to moderately elevated (often 24–30 mmHg initially) | MARKEDLY elevated (40–70+ mmHg) |
| Drainage Angle | OPEN; gonioscopy shows normal anatomy but reduced outflow | BLOCKED; iris obstructs drainage angle; gonioscopy shows angle closure |
| Vision Loss Pattern | PROGRESSIVE, PERIPHERAL first (tunnel vision); CENTRAL vision preserved until late | ACUTE central and peripheral vision loss; blurred vision with halos |
| Detection | Often detected by screening (tonometry, disc exam, visual fields); patient often unaware | PATIENT PRESENTS in distress; obvious presentation |
| Urgency | Chronic management; medications started to halt progression | OPHTHALMIC EMERGENCY; requires treatment within hours to prevent blindness |
| Treatment | Topical medications (prostaglandin analogs, beta-blockers, alpha-agonists, CAIs); laser trabeculoplasty; filtration surgery if uncontrolled | URGENT medications (miotics, systemic acetazolamide, osmotic agents, beta-blockers) PLUS emergency laser peripheral iridotomy |
| Time-Critical Component | Regular follow-up to monitor and adjust therapy; delays in diagnosis/treatment lead to irreversible vision loss over months/years | MINUTES to HOURS count; delay causes blindness within 24–48 hours |
CONDUCTIVE vs. SENSORINEURAL HEARING LOSS
| Feature | Conductive Loss | Sensorineural Loss |
|---|---|---|
| Location of Problem | Outer or middle ear (conduction pathway blocked) | Inner ear (cochlea) or CN VIII (auditory nerve) |
| Common Causes | Cerumen impaction, otitis media, TM perforation, otosclerosis, cholesteatoma, ossicular fixation | Presbycusis (age), noise exposure, ototoxic drugs, viral infection, Ménière's, acoustic neuroma, trauma |
| Reversibility | Often reversible or correctable (cerumen removal, antibiotic, surgery) | Usually PERMANENT and irreversible |
| Frequency Loss Pattern | Usually affects ALL frequencies equally (uniform loss) | Often affects HIGH frequencies first (high-frequency loss), especially in presbycusis |
| Weber Test | Lateralizes TO the affected ear (sound goes to dead ear) | Lateralizes AWAY FROM affected ear (sound goes to good ear) |
| Rinne Test | Bone conduction > Air conduction (BC > AC) on affected side — REVERSE of normal | Air conduction > Bone conduction (AC > BC) — same as normal, but both decreased |
| Bone Conduction Threshold on Audiometry | NORMAL (bone conduction bypasses middle ear) | ELEVATED (inner ear damage affects both AC and BC) |
| Speech Discrimination | NORMAL — can understand speech if loudness is adequate (hearing aid amplifies well) | POOR — cannot understand speech even with amplification; distorted perception |
| Response to Hearing Aid | Excellent response; amplification restores hearing effectively | Variable response; may help with mild-moderate loss; severe loss may need cochlear implant |
| Tinnitus | Less common | Common and often prominent |
GLAUCOMA MEDICATIONS: Mechanism, Timing, & Precautions
| Drug Class | Examples | Mechanism (IOP Reduction) | Frequency | Key Precautions / Monitoring |
|---|---|---|---|---|
| Prostaglandin Analogs | Latanoprost, travoprost, bimatoprost | Increase uveoscleral (unconventional) aqueous outflow | Once daily (evening) | Iris darkening (permanent), eyelash growth/darkening; conjunctival hyperemia; may increase uveitis risk |
| Beta-Blockers (non-selective) | Timolol, levobunolol, carteolol | Decrease aqueous humor production by ciliary body | Twice daily | PUNCTAL OCCLUSION essential to reduce systemic absorption; contraindicated in asthma, COPD, bradycardia, heart block; fatigue, depression, sexual dysfunction |
| Beta-Blockers (selective) | Betaxolol | Decrease aqueous production (beta-1 selective) | Twice daily | Safer in asthma/COPD; less effect on HR/BP; still use punctal occlusion |
| Alpha-2 Agonists | Brimonidine, apraclonidine | Reduce aqueous production; increase uveoscleral outflow | Two to three times daily | Local allergic reaction common; systemic absorption can cause CNS effects (drowsiness, dry mouth); monitor BP |
| Carbonic Anhydrase Inhibitors (Topical) | Dorzolamide, brinzolamide | Decrease aqueous production by inhibiting carbonic anhydrase | Two to three times daily | Minimal systemic effects; compatible with most other drops; local stinging common |
| Carbonic Anhydrase Inhibitors (Systemic) | Acetazolamide (oral or IV) | Decrease aqueous production systemically | Two to four times daily | Metabolic acidosis, paresthesias (tingling), hyperkalemia, hypokalemia risk; contraindicated in renal failure; used for acute IOP crisis |
| Miotics (Cholinergics) | Pilocarpine | Constrict pupil (miosis) to open drainage angle; increase aqueous outflow | Two to four times daily | Headache, accommodation spasm (blurred vision), myopia; especially useful in angle-closure glaucoma; less used now with newer agents |
| Rho-Kinase Inhibitors | Netarsudil | Increase conventional and uveoscleral outflow; reduce aqueous production | Once or twice daily | Conjunctival hyperemia (very common); corneal verticillata; newer class; good tolerability |
OTITIS EXTERNAL vs. OTITIS MEDIA
| Feature | Otitis Externa | Otitis Media |
|---|---|---|
| Location | External auditory canal (outer ear) | Tympanic cavity (middle ear) |
| Common Causes | Water exposure, trauma (cotton swabs), bacterial/fungal infection, dermatitis | Viral URI, bacterial pathogens (Streptococcus pneumoniae, Haemophilus influenzae), eustachian tube dysfunction |
| Most Common Organisms | Pseudomonas aeruginosa, Staphylococcus aureus, fungi (Aspergillus, Candida) | Streptococcus pneumoniae, Haemophilus influenzae type b, Moraxella catarrhalis |
| Age of Presentation | Any age; common in swimmers | Children <3 years (Eustachian tube anatomy); can occur any age |
| Ear Pain Trigger | Pulling auricle or pressing tragus INCREASES pain (pathognomonic sign) | Tympanic membrane may bulge; pain relieved if membrane perforates and drains |
| Examination Findings | Swollen, erythematous canal; debris/discharge in canal; normal tympanic membrane | Bulging, erythematous, opaque tympanic membrane; fluid level behind membrane; possibly ruptured membrane with drainage |
| Fever | Minimal or absent unless severe infection | Present (often moderate to high) |
| Hearing Loss | Conductive loss if canal is swollen/blocked; temporary | Conductive loss from fluid; resolves after treatment or spontaneous drainage |
| Treatment | Topical antibiotic/steroid drops (neomycin-polymyxin B-hydrocortisone, fluoroquinolone); keep ear dry; analgesics | Analgesics, antibiotics (amoxicillin first-line if bacterial), nasal decongestants; myringotomy tubes if recurrent |
| Prevention/Teaching | Keep ears dry (alcohol or vinegar drops after swimming); avoid insertion of foreign objects; do not pick at ears | Complete antibiotics; avoid water in ear during infection; keep ears dry; treat upper respiratory infections promptly |
Diagrams
Acute Eye Pain & Red Eye Differential Diagnosis
Rapid triage flowchart for acute eye pain and red eye to differentiate between emergencies (angle-closure, retinal detachment) and chronic conditions (cataract, open-angle glaucoma). Essential for NLE scenario questions.
Glaucoma: Types, Mechanisms, and Management
Comprehensive mind map organizing glaucoma types, clinical presentations, IOP values, and management strategies. Helps students understand the contrast between chronic open-angle glaucoma and emergency angle-closure glaucoma.
Cataract Surgery: Preoperative to Postoperative Timeline
Timeline showing key milestones from cataract surgery preoperative education through 6-week postoperative recovery. Emphasizes IOP precautions, medication use, activity restrictions, and red-flag symptoms requiring urgent evaluation.
Retinal Detachment: Progression and Surgical Urgency
State diagram illustrating the progression of retinal detachment from normal retina through vitreous traction, retinal break, and progressive detachment. Emphasizes the critical window for surgical intervention to preserve vision, especially macula-sparing cases.
Ototoxic Medication Categories and Risk
Visual distribution of ototoxic medication categories by risk level. Helps students quickly identify which medication classes require baseline and periodic hearing monitoring and early symptom detection for ototoxicity.
Hearing Loss Assessment: Weber and Rinne Testing
Clinical decision tree for using Weber and Rinne tuning-fork tests to differentiate conductive from sensorineural hearing loss. Includes interpretation logic and implications for diagnosis and treatment planning.