We can tolerate very large scars on our bodies with no concern except for our vanity. The retina receives the image that the cornea focuses through the eye’s internal lens and transforms this image into electrical impulses that are carried by the optic nerve to the brain. The lens focuses light through the vitreous humor, a clear gel-like substance that fills the back of the eye and supports the retina. The pupil is an adjustable opening that controls the intensity of light permitted to strike the lens. It also keeps foreign particles from entering the eye. In summary, the cornea is the clear, transparent front covering which admits light and begins the refractive process. It is responsible for capturing all of the light rays, processing them into light impulses through millions of tiny nerve endings, then sending these light impulses through over a million nerve fibers to the optic nerve.īecause the keratoconus cornea is irregular and cone shaped, light rays enter the eye at different angles, and do not focus on one point the retina, but on many different points causing a blurred, distorted image. The retina functions much like the film in a camera. In a normal eye, the light rays come to a sharp focusing point on the retina. Light rays pass through a dense, transparent gel-like substance, called the vitreous that fills the globe of the eyeball and helps the eye hold its spherical shape. This clear, flexible structure works like the lens in a camera, shortening and lengthening its width in order to focus light rays properly. It has the ability to enlarge and shrink, depending on how much light is entering the eye.Īfter passing through the iris, the light rays pass thru the eye’s natural crystalline lens. The iris works like a shutter in a camera. The cornea’s refractive power bends the light rays in such a way that they pass freely through the pupil the opening in the center of the iris through which light enters the eye. Light rays enter the eye through the cornea, the clear front “window” of the eye. To understand Keratoconus, we must first understand how the eye enables us to see, and what role the cornea plays in this process.
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