*🔴Correct Answer:* C) Central Suppression scotoma 🔴The reason it’s called a central suppression scotoma ,not just suppression , has to do with how the 4Δ Base-Out test works and what area of the retina is being tested:>> 1. The 4Δ prism displaces the image by a small amount , only about 2–3° of retinal angle. 2. That means it’s testing the eye's ability to fuse very centrally, right around the fovea. 3. So, if the eye doesn’t respond to that small image shift and shows no fusional movement, it suggests the brain is specifically suppressing the central area of that eye’s vision i.e., a central suppression scotoma. *If it were general suppression:* Larger image shifts or other binocular tests (like Worth 4 Dot at distance) would also show complete suppression, affecting both central and peripheral vision.