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Different kinds of light sensitive organs are found in a variety of organisms. The simplest eyes do nothing but detect whether the surroundings are light or dark, while more complex eyes can distinguish shapes and colors. The visual fields of some such complex eyes largely overlap, to allow better depth perception, as in humans; and others are placed so as to minimize the overlap, such as in rabbits and chameleons.
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They spread tears on the eyes, which contains substances which help fight bacterial infection as part of the immune system. Some aquatic, READ ON...
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Different cone cells respond to different wavelengths of light, which allows an organism to see color. This gives humans a highly detailed central vision, allowing reading, bird watching, or any other task which primarily requires looking at things.When a creature with binocular vision looks at an object, the eyes must rotate around a vertical axis so that the projection of the image is in the centre of the retina in both eyes. If a ray of light were to reach just
Similarly, while moving, the brain must compensate for the motion of the head by turning the eyes towards the current point of interest in the field of view being progressively lower resolution as it gets further from the fovea. Following an object moving at constant speed is relatively easy, though the eyes will often make saccadic jerks to keep up. To look at an object closer by, the eyes rotate 'towards
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APOD: 2006 November 12 - The Cat's Eye Nebula
A different astronomy and space science related image is featured each day, along with a brief ... Discover the cosmos! Each day a different image or photograph of our fascinating universe is ...
APOD: 2002 March 24 - The Cat's Eye Nebula
Astronomy Picture of the Day . Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional ...
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