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From: eager@amd70.UUCP
Newsgroups: net.micro
Subject: Re: Your eyes see orange walls, my eyes flicker
Message-ID: <4268@amd70.UUCP>
Date: Tue, 31-Jan-84 21:24:20 EST
Article-I.D.: amd70.4268
Posted: Tue Jan 31 21:24:20 1984
Date-Received: Thu, 2-Feb-84 01:28:39 EST
References: <192@intelca.UUCP>
Organization: AMD, Santa Clara, CA
Lines: 15

It appears that the rods in the retina have higher frequency response than
the cones.  The cones are in the center of the retina and are responsible 
for color vision.

If you look at a flouresent lamp out of the corner of your eye you can 
sometimes see the flicker.  The same with the 60 Hz flicker of the CRT.
The peripheral vision is also more sensitive.  At night, it is possible
to see things out of your direct line of sight which cannot be seen when
looked at directly.  The best way to find something moving in the sky,
especially at night, is not to look for it.  Keep the eyes un-directed and
moving; a moving object will be noticed easier than concentrating on an
area.

Good book:  Gregory, "Eye and Brain".