The eye is an important sense organ. It is made up of 3 coats. The outer coat is the cornea and sclera. The middle coat is the uveal tract and the inner coat is the retina. The uveal tract consists of 3 parts. The iris is the visible part of the uvea and gives color [...]

Refraction test The refraction test is an eye exam that measures a person's prescription for eyeglasses or contact lenses. How the Test is Performed This test is performed by an ophthalmologist or optometrist. Both of these professionals are often called "eye doctor." You sit in a chair that has a special device (called a phoropter [...]