The Human Eye

Topics: Eye, Retina, Visual perception Pages: 3 (894 words) Published: December 17, 2012
Human Eye
The eye is a wonderful and the most complex organ of the human body. It is strange to learn that such a small organ has so many parts. The human eye provides us with the ability to visualize the world around us. Light enters the eye through the cornea and excites special neurons on the retina. The brain receives this information and interprets it so that we are aware of what we are seeing. The parts of the eye contribute to its proper function.

A.Parts of the Human Eye

A1 Cornea
The cornea is a round, transparent dome that acts as the outer window of the eye. It is the structure that focuses the light that enters the eye. It comprises five parts. All the parts work together to protect the eye and help in the proper working of the cornea as a whole.

A2 The Lens
The lens is that part of the human eye that is located immediately behind the iris. It is transparent, elastic and crystalline. Its role is to focus the light and move towards the retina.

A3 The Uvea
The uvea forms the center of the eyeball. It is made up of three parts, choroid, ciliary body and iris. The choroid is a thin membrane that is placed between the outer protective sclera and retina. Its function is to prevent the rays of light from bouncing off on the back side of the eye. Malfunctioning of the choroid may cause the formation of confusing images. The role of ciliary body is to assist in the adjustment of the shape of the lens. The iris is described as a separate part in this section of the article.

A4 The Iris
The colored part of the eye is known as iris. It is present in the eye in the form of a thin diaphragm. The iris lies between the cornea and the crystalline lens. The color is due to the presence of a pigment. It is the iris that gives your eyes a particular color. The basic iris colors are blue, green and brown. Majority of humans have varying shades of these colors. It is composed of connective tissues and smooth muscle fibers. The...
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