Question

what are uses of pupil,cornea,sclera,retina,optic nerve andciliary muscles ​

Answer 1

Pupil = it is the small opening through which the light enters our eye
Cornea = transparent covering of eye that protects it , It is also the region where most of the refraction takes place
Retina = Light sensitive screen where an image is formed
Optic nerve = Carries the electrical impulses generated by the light sensitive cells of retina to our brain
Ciliary muscles = Changes the curvature of the eyelens , Helps us to view between near and far objects

Answer 2

PUPIL: It is a small hole between the iris through which light enters the eye. In dim light, it opens up completely due to expansion of iris muscle, but in bright light it becomes very small due to contraction of iris muscle.

CORNEA: It is the transparent spherical membrane covering the front of eye. Light enters the eye through the membrane. Most of the refraction of light rays entering the eye ouccurs at the outer surface of the cornea.

SCLERA: It is an opaque, fibrous, protective, outer layer of the eye containing collagen and elastic fiber. It is also known as white of the eye.

OPTIC NERVE: It transmits visual information from the retina to the brain.

RETINA: It is the light - sensitive surface of the eye on which the image is formed. It contains light - sensitive rods and cones. Rods cells respond to the intensity of light and cones respond to the illumination.

Their number is around 125 million.

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