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TIL we can see the shadows of the capillaries in our eyes. Our brains just ignore them because they offer no useful information to us (kind of like how you don't see your nose unless you focus on it.) This is called the Troxler Effect. I linked a procedure you can follow to see the shadows yourself.
TIL about Anton Syndrome where some people become blind but deny their blindness. Patients with Anton Syndrome are often found describing people or surroundings that are not present or walking into objects though the patient will continue to deny that they can't see even when presented with evidence