Anatomy of Uvea
Uvea is the middle vascular coat of the eyeball. From anterior to posterior, the uvea or uveal tract can be divided into three parts- Iris, Ciliary body, and choroid. The name “uvea” has originated from the Latin word grape. Why a grape? If the stem is removed from a grape, the hole looks like the pupil and the grape the eyeball. Iris : Iris is the anterior-most part of the uveal tract. It is a thin and circular structure which forms a diaphragm like structure in front of the crystalline lens. The word “iris” has originated from a Greek word. In Greek mythology, the iris is the name of the Greek goddess of the rainbow. The diaphragm formed by the iris contains a central aperture known as the pupil. The location of the pupil is not exactly central, its little nasal to the center. The pupil determines the amount of light entering the eye. The normal size of the pupillary aperture is 3-4 mm. Details on the pupil will be discussed in chapter "Pupil". Iris is attached to the middle of the a

