Guessing this is a biology question. Essentially that question. Lots of animals swim in what is “dirty” water and don’t seem to react to getting sand or debris in their eyes.
Humans? A speck of anything and we’re searching feverishly to get it out.
So what’s the difference? I know some animals have a second eyelid but not all.
ETA: I should have asked more clearly about other animals as well that don’t have multiple eyelids. Do they not have nerve endings in their eyes the way humans do?
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