Eye. Definition

Medical Definition: eye

Body vision. Has a nearly spherical shape, with an approximate diameter of 2.5 cm and is housed in the orbital cavity. Consists of three decks, from the outside in, are: sclera, choroid and retina. The sclera is the protective layer, for their hard consistency. The choroid is the vascular tunic and the retina the visual layer. The sclera, in front, has a smaller radius, so it is prominent, the cornea is, moreover, transparent, allowing light rays to penetrate the eyeball. In addition to the covers, the eye has a refraction system that is constituted by the aqueous and vitreous humor and lens system: the cornea and lens (v.).

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