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This is a clinician-written, evidence-based summary aligned to the USMLE Step 2 CK Content Outline. It is intended for medical students preparing for USMLE Step 2 CK. Management reflects current ACC/AHA, USPSTF, and APA guidelines. Always cross-reference with UpToDate, institutional protocols, and clinical judgment.
The Bottom Line
- Retinal detachment is an ophthalmic emergency; vision outcome depends on whether the macula is still attached
- Classic symptoms: photopsias, sudden floaters, and a curtain/shadow descending across the visual field
- Rhegmatogenous detachment is most common and follows a retinal tear, often after posterior vitreous detachment
- Risk factors: high myopia, trauma, prior cataract surgery, lattice degeneration, prior detachment, and family history
- Next best step: urgent same-day ophthalmology; ocular ultrasound if fundus cannot be visualized
Overview
Retinal detachment occurs when the neurosensory retina separates from the underlying retinal pigment epithelium, interrupting photoreceptor metabolic support. Rhegmatogenous retinal detachment is the classic USMLE form: a full-thickness retinal break allows liquefied vitreous to enter the subretinal space. Tractional detachment occurs when fibrovascular membranes pull the retina, classically in proliferative diabetic retinopathy. Exudative detachment results from subretinal fluid accumulation without a tear, such as from inflammation, tumor, or severe hypertension.
Epidemiology
Retinal detachment is uncommon but vision-threatening. It is more frequent in older adults due to posterior vitreous detachment and in younger highly myopic or trauma-exposed patients. Cataract surgery increases lifetime risk, especially in men, younger surgical patients, high myopes, and those with intraoperative posterior capsule rupture. A prior detachment in one eye increases risk in the fellow eye.
Clinical Features
Symptoms
Sudden onset floaters, often described as black dots, cobwebs, or smoke
Photopsias: brief flashes of light from vitreoretinal traction
Curtain, veil, or shadow moving across the visual field
Painless vision loss; pain suggests another diagnosis such as keratitis, uveitis, or angle closure
Central acuity loss if the macula is detached
Signs
Dilated fundus exam may show elevated, mobile, corrugated retina
Retinal tear, horseshoe tear, lattice degeneration, or pigment cells in anterior vitreous (Shafer sign)
Reduced red reflex if vitreous hemorrhage is present
Relative afferent pupillary defect if detachment is large or longstanding
Tractional membranes in proliferative diabetic retinopathy
Investigations
First-line
Dilated fundus examinationBest diagnostic test when view is adequate; identifies detachment, tear location, macular status, and vitreous hemorrhage
Visual acuity and visual fieldsDocument baseline acuity and field defect; macula-on detachments are most urgent to prevent central vision loss
Slit-lamp examinationLook for pigment cells in anterior vitreous (tobacco dust/Shafer sign), trauma, or associated inflammation
Second-line
Bedside ocular ultrasoundHigh-yield ED test when fundus view is obscured; shows a mobile echogenic membrane tethered at optic disc and ora serrata
Optical coherence tomography (OCT)Useful for subtle macular involvement or shallow detachments but not required for obvious emergency presentation
Specialist
Retina surgical evaluationDefines repair strategy: laser retinopexy, pneumatic retinopexy, scleral buckle, pars plana vitrectomy, or combined approach
1
Immediate actions
- Urgent same-day ophthalmology referral for suspected retinal detachment
- Keep patient NPO if surgical repair is likely
- Avoid unnecessary delay for CT head or outpatient optometry referral when classic symptoms are present
- If trauma is suspected, protect the eye and evaluate for open globe before ultrasound or pressure on the globe
2
Retinal tear without detachment
- Symptomatic horseshoe tears usually require laser photocoagulation or cryotherapy to prevent detachment
- Asymptomatic atrophic holes may be observed depending on risk factors and location
- Educate about warning symptoms: new flashes, floaters, curtain, or decreased vision
3
Rhegmatogenous retinal detachment repair
- Macula-on detachment: emergency repair, often within 24 hours, to preserve central vision
- Macula-off detachment: urgent repair; visual prognosis depends on duration and height of macular detachment
- Options: pneumatic retinopexy for selected superior breaks, scleral buckle, pars plana vitrectomy, laser, cryotherapy, and gas or silicone oil tamponade
- Postoperative positioning may be required depending on gas bubble location
4
Tractional or exudative detachment
- Tractional detachment threatening the macula: vitrectomy with membrane peeling
- Treat underlying proliferative diabetic retinopathy with anti-VEGF and/or panretinal photocoagulation as appropriate
- Exudative detachment: treat the underlying inflammatory, vascular, malignant, or hypertensive cause
Complications
- Permanent vision loss: Especially when macular detachment is prolonged
- Proliferative vitreoretinopathy: Scar contraction causing recurrent detachment
- Vitreous hemorrhage: May obscure fundus and complicate repair
- Cataract: Can progress after vitrectomy
- Recurrent detachment: Requires additional surgical intervention
USMLE Step 2 CK Exam Tips
- 1Flashes + floaters + curtain over vision = retinal detachment until proven otherwise
- 2Retinal detachment is painless; painful red eye suggests angle closure, keratitis, or uveitis
- 3Best next step is urgent ophthalmology, not reassurance
- 4Ocular ultrasound is useful when fundus cannot be visualized, especially with vitreous hemorrhage
- 5High myopia, trauma, and prior cataract surgery are classic risk factors
- 6Macula-on detachment is more urgent because central vision can still be saved
- 7Traction retinal detachment in long-standing diabetes is due to fibrovascular proliferation
- 8A posterior vitreous detachment alone causes flashes/floaters but no curtain; retinal tear/detachment must be excluded
practicetest your knowledge on retinal detachmentApply what you've learnt with USMLE Step 2 CK-style questions from the iatroX Q-Bank — ophthalmology and beyond.
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