Write the function of each of the following parts of human eye.
- Cornea.
- Iris.
- Crystalline lens.
- Ciliary muscles.
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- Cornea: focuses light rays and permits the light to enter the eye.
- Iris: Controls amount of light entering the eye and controls the size of pupil.
- Crystalline Lens: Converges light rays onto retina.
- Cilliary Muscles: Adjusts focal length of eye lens by contraction and relaxation so that sharp image can be obtained on the retina. It helps in accommodation.
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