![]() The remaining components of the eye keep it in its required shape, nourish and maintain it, and protect it. The retina makes a connection to the brain via the optic nerve. ![]() In order, along the optic axis, the optical components consist of a first lens (the cornea-the clear part of the eye) that accomplishes most of the focussing of light from the outside world then an aperture (the pupil) in a diaphragm (the iris-the coloured part of the eye) that controls the amount of light entering the interior of the eye then another lens (the crystalline lens) that accomplishes the remaining focussing of light into images then a light-sensitive part of the eye (the retina) where the images fall and are processed. It is approximately spherical in shape, with its outer layers, such as the outermost, white part of the eye (the sclera) and one of its inner layers (the pigmented choroid) keeping the eye essentially light tight except on the eye's optic axis. ![]() The eye can be considered as a living optical device. The human eye is a sensory organ, part of the sensory nervous system, that reacts to visible light and allows humans to use visual information for various purposes including seeing things, keeping balance, and maintaining circadian rhythm. ![]()
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