What is common with progressive retinal atrophy (PRA)?

What is common with progressive retinal atrophy (PRA)?

• A. Secondary cataracts = why we MUST do electroretinogram prior to cataract surgery
• B. Night blindness at early stage
• C. Enlargement of the optic nerve
• D. Increased intraocular pressure

Answer: (A)

PRA is a retinal disease where photoreceptors progressively fail, so vision deteriorates over time. A key clinical point is that lens opacities like cataracts can coexist or mimic ocular problems, and removing a cataract won’t restore vision if the retina is already nonfunctional from PRA. That’s why an electroretinogram is done before cataract surgery: it tells you how well the retina is working. If the ERG is markedly reduced or flat, the prognosis for improving vision after cataract removal is poor, so the surgery may not be beneficial. This practical step—using ERG to assess retinal function prior to cataract intervention in suspected PRA—captures a common management consideration. Night blindness is a known early symptom of PRA, reflecting rod photoreceptor loss, but the emphasis here is on the preoperative assessment that guides treatment decisions. Enlargement of the optic nerve and increased intraocular pressure are not typical or defining features of PRA.

PRA is a retinal disease where photoreceptors progressively fail, so vision deteriorates over time. A key clinical point is that lens opacities like cataracts can coexist or mimic ocular problems, and removing a cataract won’t restore vision if the retina is already nonfunctional from PRA. That’s why an electroretinogram is done before cataract surgery: it tells you how well the retina is working. If the ERG is markedly reduced or flat, the prognosis for improving vision after cataract removal is poor, so the surgery may not be beneficial. This practical step—using ERG to assess retinal function prior to cataract intervention in suspected PRA—captures a common management consideration.

Night blindness is a known early symptom of PRA, reflecting rod photoreceptor loss, but the emphasis here is on the preoperative assessment that guides treatment decisions. Enlargement of the optic nerve and increased intraocular pressure are not typical or defining features of PRA.