Your Eye Cares
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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[1] Trilobites, which are now extinct, had unique compound eyes.[12][14][15] The choroid contains blood vessels that supply the retinal cells with necessary oxygen and remove the waste products of respiration. Vergence movements are closely connected to accommodation of the eye. In humans, the eyebrows redirect flowing substances (such as rainwater or sweat) away from the eye. Water in the eye can alter the refractive properties of the eye and blur vision. This results in the high visual acuity, or the high ability to distinguish between
In this, they differ from most other arthropods, which have soft eyes. Most creatures will automatically react to a threat to its eyes (such as an object moving straight at the eye, or a bright light) by covering the eyes, and/or 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. This light causes chemical
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