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| # 1. National Eye Institute-National Institute of Health Photo Images and Video, Eye Tests Every About Eyes From the United States Department of Health Click below to bring in the article |
| # 2. How Are Human Eye Colors Inherited? To learn how we end up with the eye colors we are born with, go to: http://www.athro.com/evo/gen/inherit1.html |
| # 3. Persistence of Vision (World Book Encyclopedia) The brain does not see a light until about a tenth of a second after the light is turned on. The image persists, or lasts, about a tenth of a second after the light is turned off. This persistence of the visual image explains why a glowing matchstick seems to leave a trail behind it when thrown away in the dark. A motion-picture projector throws about 24 still pictures on the screen in a second. But we see a continuous, smooth movement. Each picture on the screen is presented to the eye before the previous image in the brain fades out. Television also depends on persistence of vision. |
| # 4. Right or Left Eyed? (World Book Encyclopedia) Most persons are either right-eyed or left-eyed, just as most persons are either right-handed or left-handed. To determine which is your dominate eye, hold a pencil vertically in front of you at eye level. With both eyes open, line up the tip of the pencil with a distant object. Close one eye at a time. Whichever eye is open when the pencil remains lined up with the object is the dominant eye. The eyes cannot focus on both the pencil and the distant object so that both images fall on corresponding points of the retina. When both eyes are open, the brain records the image seen by the dominant eye. It suppresses the part of the other image that does not fall on a corresponding point in the retina. |