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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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This is in direct contrast to the situation with cones, where each cone cell is connected to a single bipolar cell, which then connects to a single ganglion cell by which information is relayed to the visual cortex. Without changing input, these cells would otherwise stop generating output.The optokinetic reflex is a combination of a saccade and smooth pursuit movement. There are many diseases, disorders, and age-related changes that may affect the eyes and surrounding structures. The intensity of light (e. This increases refractive
These changes contribute to the etiology of several eyelid disorders such as ectropion, entropion, dermatochalasis, and ptosis. For example, birds of prey have much greater visual acuity than humans, and some can see ultraviolet light. Separation of the forward layer again forms a humour, the aqueous humour. This enables snails to keep out of direct sunlight. Therefore, for any detailed visually guided tasks on which performance varies with illumination, older persons require
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