This is how someone with hemianopsia sees the world. The sight is not due to eye damage. It’s due to a brain injury that literally blanks out one half of everything they look at. The complicating factor is that sometimes, the patients don’t even realize that they can’t see.
A stroke does damage to the brain, and you can’t predict what sort of damage it will do. That’s part of what’s so scary about it. One effect of a stroke, or occasionally another brain injury, is a strange blanking of one side of a person’s visual field. The condition is called hemianopsia — a related injury, quadrantanopsia, blanks out a quarter of the visual field — and it’s caused by damage to the path between the optic nerve and the visual cortex. It involves no damage to the eye, which can receive signals as well as it ever did.
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