explain the defects of human eye their causes and ways to correct them
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The Human eye works on the refraction of light through a natural convex lens made up of transparent living material and enables us to see things around us. And the ability to see is called vision, eyesight or drishti. Human eye consists of cornea, iris, pupil, ciliary muscles, eye lens, retina and optical nerve.
It is due to the support of ciliary muscles that the eye lens is held in position. Eye lens is flexible and thus can change its focal length and shape with the help of ciliary muscles.
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