Retinal detachment is best described as which of the following?

• A. A small horseshoe-shaped tear allowing subretinal fluid to leak between retinal pigment epithelium and the outer layer, pulling the retina away from its blood supply
• B. Inflammation of the optic nerve
• C. Bleeding into the vitreous humor
• D. A cataract formation

Answer: (A)

The main concept here is understanding how retinal detachment develops at the tissue level. Retinal detachment most often happens when a small tear in the retina allows vitreous fluid to seep into the space beneath the neurosensory retina, between it and the retinal pigment epithelium. This fluid buildup causes the retina to lift away from its underlying blood supply, particularly the choroidal circulation and the RPE, leading to detachment and potential vision loss. Describing the tear as a small horseshoe-shaped break that lets subretinal fluid leak between the retinal pigment epithelium and the outer layer captures that mechanism and why the retina pulls away.

This differs from the other conditions: inflammation of the optic nerve is optic neuritis, which affects the nerve itself rather than causing a separation of retinal layers; bleeding into the vitreous humor is a vitreous hemorrhage, which obscures vision but doesn’t involve a retinal detachment; cataract formation is a lens opacity that blurs vision, not retinal separation.