eager@amd70.UUCP (02/01/84)
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".
dya@unc-c.UUCP (02/06/84)
References: amd70.4268 Also, the CFF varies with illuminance. Another good book: Cornsweet, "Human Vision."