Retinal Detachment: Board Review

Master retinal detachment types, exam findings, urgency, and surgical principles for NBEO, OKAP, and clinical practice.

Reviewed for accuracyAugust 1, 20263 min read

Warm-up

Which event directly creates a rhegmatogenous retinal detachment?

Lesson

Retinal Detachment in 30 Seconds

Retinal detachment is separation of the neurosensory retina from the retinal pigment epithelium. Board questions test the mechanism first: a retinal break, traction, or subretinal fluid. Then identify foveal status and choose the management urgency.

Three Types You Must Know

Rhegmatogenous retinal detachment is the most common type. A full-thickness retinal break lets liquefied vitreous enter the subretinal space. Tractional retinal detachment results from fibrovascular membranes pulling retina away from the RPE initially without a retinal break, classically in proliferative diabetic retinopathy. Advanced disease can occasionally produce a combined tractional-rhegmatogenous detachment. Exudative, or serous, retinal detachment is subretinal fluid without a break, caused by entities such as choroidal tumors, posterior scleritis, or Vogt-Koyanagi-Harada disease. The key divider is a break: RRD needs break-directed repair, tractional disease needs treatment of traction and ischemia, and exudative disease needs treatment of its underlying cause.

Rhegmatogenous Retinal Detachment in Detail

Classic symptoms are new floaters, flashes of light (photopsias), and a peripheral curtain or shadow.
Determine macula-on versus macula-off status. A macula-on detachment needs same-day retinal assessment and urgent repair to preserve central vision. Superior breaks generally progress more rapidly than inferior breaks because gravity allows subretinal fluid to spread more quickly, making superior macula-on detachments especially urgent.
Vitreous liquefaction followed by posterior vitreous detachment is the usual precipitating event. Persistent vitreoretinal adhesion can create a tear. Pigment cells in the anterior vitreous, called tobacco dust or Shafer sign, strongly suggest a retinal break until proven otherwise.
Risk factors include myopia, lattice degeneration, prior ocular surgery especially cataract surgery, and trauma.
Main surgical options are pneumatic retinopexy, scleral buckle, and pars plana vitrectomy, either alone or in combination. The break pattern, lens status, proliferative vitreoretinopathy, and surgeon assessment guide selection.

4 Facts Exams Always Ask

New flashes alone still warrant urgent dilated examination. They may reflect acute vitreoretinal traction before floaters, a tear, or field loss develops.
Macula-on RRD needs urgent assessment because fluid may extend under the fovea. Macula-off RRD remains urgent, but visual prognosis relates to foveal detachment duration and height.
High myopia raises RRD risk because axial elongation stretches and thins peripheral retina, promotes lattice degeneration, and accelerates vitreous liquefaction.
Tractional detachment is usually concave and tethered by membranes, often requiring vitrectomy when vision-threatening. Exudative detachment has no break, shifts with head position, and requires treatment of the inflammatory, neoplastic, or vascular cause.

The Classic Trap

Do not assume every detachment has a retinal break or needs the same surgery. Exudative detachments shift with position and have no break. Tractional detachments are concave and lack a break, though advanced proliferative disease can produce a combined tractional-rhegmatogenous detachment with a secondary break. RRD is typically mobile, convex, and bullous.

Clinical Pearl

In a patient with acute flashes and floaters, the exam question is not "Is this a posterior vitreous detachment?" It is "Did the posterior vitreous detachment create a retinal tear?" A symptomatic acute posterior vitreous detachment requires careful peripheral retinal examination including scleral depression.

Check yourself

Checkpoint 1

Which risk factor is considered especially important for rhegmatogenous retinal detachment?

Checkpoint 2

Which clinical feature best favors exudative rather than tractional retinal detachment?

Clinical case

A 58-year-old pseudophakic high myope reports one day of flashes, new floaters, and an inferonasal shadow in the right eye. Dilated examination shows a superotemporal horseshoe tear with a mobile convex detachment approaching but not involving the fovea.

What is the most appropriate next step?

Explanation

This is a macula-on rhegmatogenous retinal detachment from a horseshoe tear. Macula-on detachments require same-day retinal specialist assessment because subretinal fluid may extend under the fovea, threatening central vision. Superior breaks progress especially rapidly because gravity allows fluid to spread quickly.

Case discussion

This is a macula-on rhegmatogenous retinal detachment from a horseshoe tear. The superior break explains the inferior visual-field shadow. Macula-on status with a superior break requires same-day retinal specialist assessment because superior detachments progress especially rapidly. Pneumatic retinopexy, scleral buckle, or pars plana vitrectomy may be selected based on the full break configuration.

Sources & Reviewer Info

Reviewed by Vasilis Inglezis: Optometrist and Ocular Oncology Imaging Specialist, Ocular Oncology Center, Athens, Greece. Last updated August 1, 2026.

References

Feltgen N, Walter P. "Rhegmatogenous Retinal Detachment: An Ophthalmologic Emergency." Deutsches Ärzteblatt International. 2014;111(1-2):12-22. doi: 10.3238/arztebl.2014.0012.
Jalali S. "Retinal Detachment." Community Eye Health. 2003;16(46):25-26.

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