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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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Some insect larvae, like caterpillars, have a different type of simple eye (stemmata) which gives a rough image. However, the human, READ ON...
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Under normal conditions, changing the focus of the eyes to look at an object at a different distance will automatically cause vergence and accommodation. Aging causes laxity and downward shift of eyelid tissues and atrophy of the orbital fat. Too much light being let in could damage the retina; too little light makes sight difficult.[14][17] Within the anterior segment are two fluid-filled spaces: the anterior chamber and the posterior chamber.Human eyes respond to light with
Cycles per degree (CPD) measures how much an eye can differentiate one object from another in terms of degree angles. Some insect larvae, like caterpillars, have a different type of simple eye (stemmata) which gives a rough image. Jumping spiders have simple eyes that are so large, supported by an array of other, smaller eyes, that they can get enough visual input to hunt and pounce on their prey.
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