USMLE Step 2 CK Ophthalmology Otolaryngology Study Guide

Ophthalmology on Step 2 CK focuses heavily on acute presentations and their management. You must master several foundational areas to succeed.

Red Eye Differential Diagnosis

Red eye is one of the most frequently tested topics. You need to distinguish between conjunctivitis, keratitis, uveitis, acute angle-closure glaucoma, and scleritis using clinical findings.

Key differentiating features:

• Bacterial conjunctivitis: purulent discharge and minimal pain
• Viral conjunctivitis: watery discharge and preauricular lymphadenopathy
• Acute angle-closure glaucoma: severe pain, halos around lights, mid-dilated fixed pupils, vision loss (emergency)
• Keratitis: severe pain with preserved vision
• Uveitis: anterior chamber inflammation with moderate pain

Retinal and Macular Diseases

Diabetic retinopathy progresses through stages you must recognize. Look for microaneurysms, hard exudates, cotton-wool spots, and neovascularization.

Age-related macular degeneration (AMD) has two forms:

• Dry AMD: more common, slower vision loss
• Wet AMD: rapid vision loss, requires anti-VEGF injections

Retinal detachment presents with sudden floaters, flashing lights, and a descending visual field defect. This requires emergent referral.

Other High-Yield Topics

You should understand refractive errors (myopia, hyperopia, astigmatism, presbyopia) as foundational concepts. Cataracts appear frequently as case vignettes, including age-related and secondary causes (diabetes, steroid use).

Glaucoma management requires knowing intraocular pressure targets and medication classes. Prostaglandin analogs, beta-blockers, and carbonic anhydrase inhibitors all appear in Step 2 CK scenarios.

Otolaryngology questions emphasize acute infections, hearing loss, and epistaxis management. These topics appear regularly in clinical vignettes.

Ear Infections and Hearing Loss

Acute otitis media in children typically follows upper respiratory infections. Look for ear pain, fever, and tympanic membrane erythema or effusion. Treatment depends on age and severity (watchful waiting versus antibiotics).

Chronic otitis media with effusion involves Eustachian tube dysfunction. Consider tympanostomy tubes in children with speech delay.

Hearing loss classification uses Weber and Rinne tuning fork tests:

• Weber lateralizing to affected ear = conductive loss
• Weber lateralizing away = sensorineural loss
• Conductive loss = middle ear problem
• Sensorineural loss = inner ear or nerve problem

Sudden sensorineural hearing loss is a medical emergency. Treat immediately with corticosteroids before irreversible damage occurs.

Sinus and Throat Infections

Acute sinusitis differs from viral rhinosinusitis by symptom duration beyond 10 days and purulent findings. Treatment progresses from supportive care to antibiotics if secondary bacterial infection occurs.

Mastoiditis is a serious complication of otitis media requiring hospitalization and possibly CT imaging.

Epiglottitis, increasingly rare due to Hib vaccination, remains a medical emergency causing stridor and dysphagia.

Acute pharyngitis with streptococcal causes requires knowing complications: peritonsillar abscess, retropharyngeal abscess, and acute rheumatic fever risk.

Vertigo and Epistaxis

Benign paroxysmal positional vertigo (BPPV) responds to Canalith repositioning procedures like the Epley maneuver. Distinguish peripheral causes from central causes carefully.

Epistaxis management follows a stepwise approach: observation, anterior packing, posterior packing, and angiography intervention based on severity.

Obstructive sleep apnea (OSA) recognition and CPAP therapy understanding complete core otolaryngology content.

Step 2 CK expects you to apply diagnostic algorithms efficiently in timed conditions. Mastering these frameworks is essential.

Red Eye Assessment

For red eye, follow this systematic approach:

1. Assess visual acuity
2. Evaluate pain level
3. Examine discharge type
4. Perform slit-lamp examination

Key clinical pearl: severe pain with preserved vision suggests keratitis or uveitis. Severe pain with vision loss indicates glaucoma or scleritis.

Fluorescein staining reveals corneal abrasions as linear vertical streaks. Hyphema appears as layered blood in the anterior chamber requiring ophthalmology referral.

Hearing Loss and Vertigo Assessment

Establish timeline first to separate sudden sensorineural losses (medical emergency) from gradual presbycusis.

Conduct Weber and Rinne testing properly to distinguish conductive from sensorineural causes. This directs imaging and specialist referral appropriately.

For vertigo, use the HINTS exam (head impulse, nystagmus, test of skew) to distinguish peripheral from central causes with high accuracy. Perform head impulse tests, Dix-Hallpike maneuvers, and supine roll tests.

Sinusitis and Epistaxis

In sinusitis, CT imaging helps only when considering surgery or complications like meningitis or cavernous sinus thrombosis. Plain films have limited utility.

For epistaxis, anterior versus posterior location determines management. Anterior epistaxis often responds to pressure and topical vasoconstrictor. Posterior epistaxis requires packing or angiography.

Understanding risk factors prevents missed diagnoses: Aspergillus infection in immunocompromised patients or intracranial extension complications.

Treatment management is a major Step 2 CK focus. You must know medication hierarchies and when to escalate therapy.

Glaucoma Medications

Glaucoma medications follow a specific hierarchy:

1. Prostaglandin analogs (latanoprost, travoprost): first-line, increase uveoscleral outflow
2. Beta-blockers (timolol): secondary option
3. Alpha-2 agonists: secondary option
4. Carbonic anhydrase inhibitors (acetazolamide): systemic or topical
5. Laser trabeculoplasty and surgical filtration: when medications fail

Retinal Disease Management

Anti-VEGF medications (bevacizumab, ranibizumab, aflibercept) revolutionized wet AMD and diabetic macular edema treatment. These require intravitreal injection administration.

Diabetic retinopathy prevention through glycemic control and hypertension management is essential. Treatment varies from laser photocoagulation for nonproliferative disease to anti-VEGF for proliferative disease.

Dry eye management progresses:

• Artificial tears
• Topical antiinflammatories (cyclosporine)
• Punctal plugs

Conjunctivitis and Infection Treatment

Conjunctivitis treatment depends on cause:

• Bacterial: topical antibiotics (fluoroquinolones)
• Viral: supportive care only
• Allergic: topical antihistamines or mast cell stabilizers

Otitis media treatment includes analgesics, decongestants, and antibiotics when appropriate. Amoxicillin or amoxicillin-clavulanate is first-line.

Acute sinusitis begins with saline irrigation and topical decongestants. Add antibiotics like amoxicillin-clavulanate for bacterial suspicion.

Sudden sensorineural hearing loss requires immediate corticosteroid treatment. Delayed treatment reduces recovery probability significantly.

Vertigo management includes vestibular suppressants (meclizine) for acute symptoms and vestibular rehabilitation exercises for recovery.

Flashcards prove exceptionally effective for these specialties because they require rapid recall of differentials, exam findings, and treatment algorithms.

Card Organization by Presentation

Organize cards by chief complaint to match exam format:

• Red eye differential deck
• Hearing loss assessment deck
• Epistaxis management deck
• Vertigo evaluation deck

This intuitive organization mirrors how Step 2 CK presents questions. Each card combines clinical presentation with management algorithms.

Content Strategy

For each differential diagnosis, develop cards showing clinical presentation on one side and complete management on the reverse. Example: acute angle-closure glaucoma symptoms prompt recall of emergency treatment sequence (topical and systemic IOP-lowering agents, then laser iridotomy).

Develop cards for physical exam maneuvers with technique description and expected findings. Weber and Rinne card sets help automate test interpretation.

Image-based cards work particularly well for ophthalmology. Show funduscopic findings (cotton-wool spots, hard exudates, neovascularization) requiring diagnosis. This trains pattern recognition critical for exams.

Specialized Card Types

Create cards for high-yield drug information: each glaucoma medication card includes mechanism, typical dosing, and side effects.

Use cards to practice differential diagnosis discrimination. Present case vignettes requiring selection of the most likely diagnosis from competing options, matching actual exam format.

Include cards for common complications and red flags: recognizing acute angle-closure glaucoma as vision-threatening or sudden sensorineural hearing loss as urgent intervention. These determinations could affect exam clinical decisions.

Spacing and Retention

Spaced repetition using interval schedules optimizes retention and automaticity. Since these topics involve substantial specialty-specific vocabulary, flashcards prevent confusion and keep knowledge accessible during high-pressure conditions.