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Organ of vision. In vertebrate?s, it creates real images of objects in the retina, where the light is detected and transformed into electrical impulses that are transmited through the [optical nerve]? to the brain. Its shape is roughly spherical, filled with a gel-like substance. At one extreme, covered by the cornea?, there is a muscle that controls the amount of light that enters the eye, this muscle is called the iris?. |
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An organ capable of detecting light. The simplest eyes simply detect whether the surroundings are light or dark. Compound eyes are found among the arthropods (insects and kin), and are composed of many simple facets which give a pixelated image (not multiple images as is often believed). In most vertebrate?s and some mollusks the eye works by projecting images onto a light-sensitive retina?, where the light is detected and trasmitted to the brain via an optic nerve. The eye is typically roughly spherical, filled with a gel-like substance, with a focusing lens and often a muscle called the iris? that controls how much light enters. |
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*Miopy?(spell?) |
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*Myopia? |
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