functions of cornea iris crystalline lens and ciliary muscles
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1. cornea is a transparent membrane of the eyeball where light enters the eye
2. crystalline lens are double convex lens which are held in position by ciliary muscles
3. ciliary muscles help crystalline lens to be in position and they change the focal length of eye by relaxing and contracting eye lens
4. iris is an opaque diaphragm which has a central hole called pupil
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