Cornea, External Disease, and Anterior Segment
The most anterior, clear portion of the eye is called the cornea. It is the first structure light traverses on its way into the eye. Any condition that affects the cornea can affect the cornea’s ability to help focus light on the retina, and thus affecting one’s ability to obtain a clear image. Since the cornea creates two-thirds of the focusing power of the eye, even a small change in the cornea may lead to changes in one’s vision. Conditions of the cornea may be treated with medications or cornea surgery.
