Uvea
The cornea is the clear layer covering the front of the eye. The cornea works with the lens of the eye to focus images on the retina.
Also known as: Vascular tunic
Definition
The uvea is the middle layer of the eye beneath the white part of the eye (the sclera). It consists of the iris, ciliary body, and choroid. These structures control many of the functions of the eye such as adjusting to different levels of light or different distances of objects.
References
Evans M. Uveitis and other intraocular inflammations. In: Yanoff M, Duker JS, eds. Ophthalmology. 3rd ed. St. Louis, Mo: Mosby Elsevier; 2008:chap 7.
See also:
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Special Topic
Choroid
The choroid is the layer of blood vessels and connective tissue between the (white of the eye) and . It is part of the and supplies nutrients to the inner parts of the eye. Inflammation of the choroid is called .
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Special Topic
Ciliary body
The ciliary body is the structure in the eye that releases a transparent liquid (called the aqueous humor) within the eye. The ciliary body also contains the ciliary muscle, which changes the shape of the lens when your eyes focus on something. This process is called accomodation.
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Special Topic
Iris
The iris is the colored portion of the eye located between the cornea and lens. The iris’ round, central opening (the pupil) contracts and dilates to control the entrance of light into the eye, allowing you to see well under a variety of lighting conditions.
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Special Topic
Sclera
The sclera is the white outer wall of the eye. It is a tough, fibrous tissue that extends from the cornea (the clear front section of the eye) to the optic nerve at the back of the eye. The sclera gives the eye its white color.
- Review date:
- August 11, 2009
- Reviewed by:
- David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
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