Eyes are complex structures that enable us to see by controlling the amount of light that enters into the eyeballs. It can focus on objects which are near or far away while producing continuous images that get transmitted to the brain. Orbits are the two bony cavities in the skull which hold the eyeballs. It also houses the muscles which control the movement of the eyes, nerves and blood vessels. The outermost layer of the eyeball is the white layer called the sclera and is relatively tough. The sclera is covered by a thin transparent layer called the conjunctiva which protects the sclera while also allowing light to pass through it. Light enters the eye through the cornea which forms a slight bulge on the eyeball. The cornea also helps in focusing the light into the retina which is the innermost layer. The coloured part of the eye is called an iris which pretty much works like an aperture of a camera. It regulates the amount of light entering the eye, reducing the intensity if it’s too bright outside or increasing the intensity if it’s dull or dark. Behind the iris is a vital part called lens. The lens changes its thickness as per the distance of the object it’s trying to focus on. Finally, the light rays strike at the retina which forms a clear image as it contains photoreceptor cells on it. This image is then sent to the brain through the optic nerves.
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