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Author Topic: Why haven't our irises evolved to close up entirely when facing BRIGHT sunlight?  (Read 1510 times)

Offline fizzfez

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Why do eyelids get that exclusive privilege?


Offline Bored chemist

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Eyelids are there to prevent damage to they eye and, to do that they are quick.
It's presumably easier to use the eyelids than to speed up the iris.

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