The optical system: Of the eye consists of the cornea and the lens. The cornea provides about 2/3rds of the power of the system and the lens provides the rest.
Answered 6/29/2013
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Long list: Anything that interferes with the focusing ability of the eye can be considered an optical defect. This would include the most common issues, refractive errors correctable by eyeglasses or contacts. Damage to the cornea or lens will disturb light transmission and create diminution of vision. There are inherited and developmental defects of the cornea and lens which also disturb vision.
Answered 2/4/2015
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