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Author Topic: Eye lids  (Read 2303 times)

paul.fr

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Eye lids
« on: 25/04/2007 00:22:12 »
Why when you close your eyes, does light get through? I know the eye lid is thin but does letting some light through serve a purpose?


 

Offline RD

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Eye lids
« Reply #1 on: 25/04/2007 14:30:19 »
If eyelids were totally opaque then the pupil would adapt to total darkness during a blink and dilate to its maximum size, then when the eyelid was opened vision would momentarily be compromised by overexposure, (pupils do not change size instantaneously).
So totally opaque eyelids are not a good idea.
 

another_someone

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Eye lids
« Reply #2 on: 25/04/2007 15:12:30 »
In any event, I would imagine that even when you are asleep, you want to be aware of night and day, otherwise (in the days before the alarm clock), how would you know when it was time to get up?
 

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Eye lids
« Reply #2 on: 25/04/2007 15:12:30 »

 

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