Write the function of each of the following parts of human eye

Write the function of each of the following parts of human eye :

1. Cornea
2. Iris
3. Crystalline lens
4. Ciliary muscles

Answer

Function of:

1. Cornea: focuses light rays / permits the light to enter the eye.
2. Iris: Controls amount of light entering the eye. / controls the size of pupil.
3. Crystalline Lens: Converges light rays onto retina.
4. Ciliary Muscles: Adjusts focal length of eye lens by contraction and relaxation so that sharp image can be obtained on the retina. / helps in accommodation.