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Difficulty: HardFormulating a Differential Diagnosis

Match each patient's clinical presentation of unilateral vision loss to the most appropriate diagnosis in the differential.

  • A 72-year-old with a history of carotid bruits presents with sudden, painless, profound visual loss in the right eye. Examination reveals an ipsilateral relative afferent pupillary defect and retinal opacification with a prominent central macular red hue.Central retinal artery occlusion
  • A 65-year-old with poorly controlled essential hypertension notices subacute, painless visual blurring in the left eye. Funduscopic evaluation demonstrates extensive intraretinal flame-shaped hemorrhages, cotton wool spots, and tortuous, dilated vessels.Central retinal vein occlusion
  • A 50-year-old with high myopia reports a sudden onset of multiple dark floaters and flashes of light, followed by a dark shadow progressing over the peripheral visual field. Ophthalmoscopy shows a crinkled, elevated grayish membrane in the periphery.Rhegmatogenous retinal detachment
  • A 28-year-old presents with unilateral visual dimming progressing over 48 hours, accompanied by a retro-orbital ache that exacerbates with eye movement. Visual acuity is 20/200, color vision is markedly diminished, and the optic disc appears initially normal.Optic neuritis

Answer

The presentation with the macular red hue matches central retinal artery occlusion. The presentation with diffuse hemorrhages and tortuous vessels matches central retinal vein occlusion. The presentation with floaters, flashes, and a progressing shadow matches rhegmatogenous retinal detachment. The young patient with pain on eye movement and color vision loss matches optic neuritis.
Formulating an accurate differential diagnosis for acute vision loss requires synthesizing demographic risk factors, the presence of pain, the temporal onset, and objective funduscopic findings. CRAO is defined by sudden painless loss with retinal pallor; CRVO by diffuse hemorrhages; Retinal Detachment by floaters, flashes, and a visual field defect; and Optic Neuritis by painful vision loss with a normal early fundus in young adults.

Step-by-Step Solution

1
Analyze the presence or absence of pain associated with the vision loss.
Optic neuritis presents with pain (especially on eye movement), whereas central retinal artery occlusion, central retinal vein occlusion, and retinal detachment are classically painless.
Pain is a critical distinguishing factor that helps narrow the differential diagnosis immediately.
2
Evaluate the specific timeline and nature of visual field changes.
Sudden profound loss suggests an arterial event (CRAO), whereas a progressing shadow preceded by flashes/floaters strongly suggests mechanical separation of the retina (detachment).
The temporal profile reflects the underlying pathophysiology (ischemia vs. structural tearing).
3
Differentiate based on funduscopic examination findings.
Retinal opacification with a red fovea indicates CRAO. Extensive hemorrhages ('blood and thunder') indicate CRVO. An initially normal fundus in the setting of profound vision loss and dyschromatopsia points to retrobulbar optic neuritis.
Funduscopy provides definitive structural evidence to confirm the specific differential diagnosis.

Key Concept

Formulating a differential diagnosis for acute unilateral vision loss based on pain, visual field deficits, and specific funduscopic findings.
Estimated Time:2m 0s
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Formulating a Differential Diagnosis

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