The external Structure of an Eye:
The parts of the eye that are visible externally comprise of the external structure of the eye.
1. Sclera: It is a tough and thick white sheath that protects the inner parts of the eye. It is the ‘White of the eye’.
2. Conjunctiva: It is a thin transparent membrane that is spread across the sclera. It keeps the eyes moist and clear by secreting small amounts of mucus and tears.
3. Cornea: It is the transparent layer of membrane that is spread over the pupil and the iris. The main role of the cornea is to refract the light that enters the eyes.
4. Iris: It is a pigmented layer of tissues that make up the colored portion of the eye. Its primary function is to control the size of the pupil, depending on the amount of light entering it.
5. Pupil: It is the small opening located at the middle of the Iris. It allows light to come in.
