Keratoconus

Keratoconus is a corneal abnormality where the cornea becomes thin and irregularly cone-shaped, causing decreased vision. It typically develops between the ages of 12 and 25. Mild cases can be treated with glasses, but most patients require rigid contact lenses to achieve their best vision. Occasionally, the condition becomes so severe that rigid contact lenses do not work and a corneal transplant may be required to improve vision.