Keratoconus
Keratoconus is an eye disease that is usually seen in early adulthood and lasts until the third decade of life. As a result of this disease, the normal shape of the cornea with a rounded and spherical shape, becomes conical, protruding and the patient's vision gradually decreased. Keratoconus is a progressive disease that is occurred in one or both eyes but often is bilateral.
This protrusion is most often in the lower half of the cornea and initially causes astigmatism. (Of course, not all cases of astigmatism are due to the keratoconus.) In mild cases or in the early stages of keratoconus, visual acuity can be partially corrected with glasses. As the disease progresses, vision is improved only by the use of a hard contact lens and gradually, due to the intolerance of the hard lens, surgical procedures such as intra-corneal looping and finally corneal transplantation should be used.
In the past few years, a method has been used to slow the progression of the disease called cross-linking surgery or corneal fixation.
To increase vision in cases that the glasses are not responsive, use a hard contact lens, ring or cornea transplant.