Anterior segment of eyeball

Anterior Segment of Eyeball

The Anterior Segment of Eyeball (pronounced: an-TEER-ee-or SEG-ment of EYE-ball) is the front third of the eye that includes the structures in front of the vitreous humour: the cornea, iris, ciliary body, and lens.

Etymology

The term "anterior" comes from the Latin word "anterior" which means "before" or "in front of". The term "segment" is derived from the Latin word "segmentum" which means "a piece cut off", and "eyeball" is a combination of "eye" from Old English "ēage" and "ball" from Old English "beall".

Structure

The anterior segment is divided into two chambers: the anterior chamber and the posterior chamber. The anterior chamber is filled with aqueous humour, a clear fluid that nourishes the cornea and lens. The posterior chamber lies behind the iris and in front of the lens, and is also filled with aqueous humour.

The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber. The iris is the colored part of the eye that controls the size of the pupil and thus the amount of light reaching the retina. The ciliary body produces the aqueous humour and changes the shape of the lens when the eye focuses. The lens is a transparent biconvex structure in the eye that, along with the cornea, helps to refract light to be focused on the retina.

Related Terms

• Cornea
• Iris
• Ciliary body
• Lens
• Aqueous humour
• Anterior chamber
• Posterior chamber

See Also

• Posterior segment of the eyeball
• Eye anatomy
• Visual system

External links

• Medical encyclopedia article on Anterior segment of eyeball
• Wikipedia's article - Anterior segment of eyeball

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