MadSci Network: Neuroscience

Re: Human Eyes and Light Sensitivity

Date: Tue Sep 22 10:06:34 1998
Posted By: James Clack, Faculty, Biology, Indian Univ - Purdue Univ
Area of science: Neuroscience
ID: 905654305.Ns

Your eyes (actually, your photoreceptors) are not "locked" into any given 
sensitivity when your eyes are closed.  The photoreceptors are continually 
adapting to ambient light conditions, even when your eyes are closed 
(actually, quite a bit of light can filter through your palpebrae 
[eyelids] and through your skull, so there's some light available all the 
time unless you are in a room devoid of light).  The only difference 
between the adaptational state of your photoreceptors with your eyes 
closed is the additional filtering that your eyelids afford you.

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