I read about a kitten once that was born with no eyes - just bone and skin and fur (in the normal configuration) - no eyesockets, just smooth head, nose, mouth, whiskers... All in perfect working order. It ran along just like its siblings and had absolutely no trouble. It couldn't calculate jumps, obviously, but aside from that all that was different was that its ears, eyebrows and whiskers were always cocked.
So even aside from the whole "cats can see in very little light" thing (which I naively assumed was widely known and understood!), they also have considerably superior resources when they can't see.
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