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Or would that eye be the most well-defended from external debris and whatnot in the entire world? Cats seem to get by just fine without eyelids and a membrane but no eyelashes...likewise humans with lashes and lids but no membranes...

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  • $\begingroup$ Greetings and welcome to Worldbuilding Stack Exchange! Keep up with the good questions here, and in the meantime, be sure to check out the tour and the help center for more information on how this forum works, the culture and so forth! $\endgroup$ – elemtilas Aug 11 '18 at 2:54
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NO.

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Cats actually have eye lashes, two eye lids and a nictitating membrane. They also have furry eye lids. Unless the cat suffers from trichiasis, there won't be a problem.

Ostriches as well:

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Humans have what's left of a nictitating membrane, the plica:

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    $\begingroup$ I actually picked up my cat and looked when I saw the title to this question. Cheers for including the feline reality! $\endgroup$ – JBH Aug 11 '18 at 3:37
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    $\begingroup$ Cats are wonderful little creatures indeed! I very much hope you properly worshipped your Cat today! $\endgroup$ – elemtilas Aug 11 '18 at 4:12
  • $\begingroup$ @elemtilas ...maybe i didn't say it right, but humans have upper eyelids that visibly move down and back up our eye when we blink, but when cats/dogs/etc blink, their WHOLE EYE moves? It doesn't look the same and formerly I thought that meant it wasn't? Clarification please? $\endgroup$ – CA Pichowsky Aug 11 '18 at 8:56
  • $\begingroup$ Do you mean the eye ball itself moves? It does, for humans as well as cats. As for the eyelids, both eyelids move, but a little differently and for different kinds of blinking. The most exaggerated lower lid movement happens when you squint $\endgroup$ – elemtilas Aug 11 '18 at 11:49
  • $\begingroup$ @elemtilas ... it just looks different when I see my cat do it. There's no 'fold' I guess is what I'm trying to say? $\endgroup$ – CA Pichowsky Aug 12 '18 at 21:31

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