Ophthalmology · Retinal Pathology
The facts most likely to be tested
Patients typically present with a painless loss of vision described as a curtain coming down over the visual field.
Classic prodromal symptoms include photopsia (flashes of light) and a sudden onset of floaters.
Funduscopic examination reveals a gray, elevated retina with corrugated folds.
The most common underlying mechanism is a rhegmatogenous detachment caused by a retinal tear allowing vitreous fluid to enter the subretinal space.
Risk factors include high myopia, previous cataract surgery, and ocular trauma.
Physical examination may demonstrate a relative afferent pupillary defect (RAPD) if the detachment is extensive.
Immediate management requires urgent ophthalmologic consultation for surgical repair to prevent permanent vision loss.
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A 62-year-old male presents to the emergency department complaining of a sudden onset of vision loss in his right eye. He reports seeing flashes of light and an increase in floaters over the past 24 hours, followed by the sensation of a dark curtain moving across his visual field. His past medical history is significant for high myopia and a cataract extraction performed six months ago. On physical examination, visual acuity is 20/200 in the right eye, and a relative afferent pupillary defect is noted. Funduscopic examination reveals a gray, elevated retina with corrugated folds.
What is the most likely diagnosis?
Rhegmatogenous retinal detachment
The patient's presentation of a 'curtain coming down' following photopsia and floaters, combined with the classic funduscopic finding of an elevated, corrugated retina, is pathognomonic for retinal detachment.
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Etiology / Epidemiology
Common in high myopia, cataract surgery, and trauma. Separation of the neurosensory retina from the underlying retinal pigment epithelium.
Clinical Manifestations
Painless vision loss described as a curtain coming down. Photopsia and floaters are classic prodromal symptoms.
Diagnosis
Diagnosis is confirmed via dilated funduscopy. The retina appears gray/opaque with folds.
Treatment
Emergent ophthalmology consultation for surgical repair. Avoid eye pressure and keep patient supine.
Prognosis
Visual recovery depends on macular involvement. Permanent blindness occurs if not treated promptly.
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Epidemiology & Etiology
Most common in patients aged 40-70. Significant risk factors include high myopia (nearsightedness), history of cataract extraction, and ocular trauma. It is a true ophthalmologic emergency requiring immediate intervention.
Pertinent Anatomy
The retina consists of an inner neurosensory layer and an outer retinal pigment epithelium (RPE). These layers are only loosely attached, creating a potential space for fluid accumulation.
Pathophysiology
Rhegmatogenous detachment occurs when a retinal tear allows liquefied vitreous to enter the subretinal space. This separates the neurosensory retina from the RPE, leading to ischemia of the photoreceptors. Tractional detachment results from fibrous bands pulling the retina away, while exudative detachment involves fluid leakage without a tear.
Clinical Manifestations
Patients report a sudden onset of floaters and photopsia (flashes of light). The classic description is a curtain or shadow descending over the visual field. Painless vision loss is the hallmark; if pain is present, consider alternative diagnoses like acute angle-closure glaucoma.
Diagnosis
The dilated funduscopy is the gold standard for visualization. The detached retina appears gray/opaque with visible folds and may undulate with eye movement. If the view is obscured by hemorrhage, ocular ultrasound is the diagnostic test of choice.
Treatment
Immediate ophthalmology consultation is mandatory. Patients should be kept supine with the head turned toward the side of the detachment to use gravity to keep the retina in place. Do not use miotics; surgical options include pneumatic retinopexy or vitrectomy.
Prognosis
Prognosis is excellent if the macula is attached at the time of surgery. If the macula is detached, visual recovery is significantly limited even with successful anatomical reattachment.
Differential Diagnosis
Vitreous hemorrhage: sudden vision loss but no retinal folds on exam
Posterior vitreous detachment: presence of floaters but no visual field defect
Retinal vein occlusion: diffuse retinal hemorrhages and cotton wool spots
Choroidal detachment: dome-shaped, dark brown elevation on funduscopy
Age-related macular degeneration: central vision loss with drusen, not peripheral curtain