describe+the+anatomy+and+function+of+the+human+eye,+including+the+-cornea.sclera.choroid.retina.iris.lens.aqueous+and+vitreous+humor.ciliary+body.optic+nerve*

The anatomy and function of the human eye are described below :

Conjunctiva – is a clear mucous membrane made of cells ,It covers the sclera which is located on the outer layer of the eye. Its main role is to keep the eye lubricated by producing tears, it also has something called an immune surveillance which prevents any entrance of dust, fibres etc.

Cornea–Is a located on the outer surface of the eye, it’s a strong clear bulge. It controls the amount of light entering the eye within an image creation.

Sclera - is the white part of the eye, it contains elastic fibres. It is located on the outer layer of the eye it protects the eye from getting damaged by dust.

Aqueous and vitreous humor- Aqueous is a fluid like substance which is located between the lens and the cornea. It keeps the eye steady with pressure. Vitreous humor is a structure in the eye which is like a pipe. It’s a jelly like substance that fills up in the eye which takes in the light before it gets to the retina.
 * Choroid- is made of many blood vessels which is known as the blood vessel of the eye, it is located between the retina and the sclera. It provides oxygen to the outer layers of the retina. **
 * Retina- is important to the eye as it is a sensitive tissue which is located in the inner surface of the eye. This role is important as it helps the eyes focus and to produce a clear image. **
 * Iris- the role of the iris is to control how much light May enter the eye by opening the pupil. The Iris is also known as the membrane of the eye, Iris is usually talk about the Iris as it’s the coloured part of the eye eg. Blue, brown , green etc. **
 * Lens – Is a vital part of the eye as it collects the ligh and focuses the image. It focuses on objects close and far ranged. Its structure is made of layers of tissue, the lens is transparent. **

Ciliary body – is located directly behind the iris which allows relaxtion to the lens so it can maintain a clear focus. It also creates the aqueous humor.


 * Optic nerve- Is the most important role of the eye as it carries visual information from the retina to the brain. It is made from thousands of nerve fibres. **
 * In the image below it shows where each of the function described above is located in the eye .This image is useful as it shows where each function is located in the eye: **



