Kerataconus is a corneal disorder that occurs when the surface of the eye becomes thin and irregular in shape. This condition causes light entering the eye to split and not focus correctly on the retina which severely distorts vision and causes large amounts of glare and blurred vision. This condition commonly begins with frequent changes in the astigmatism correction and will blur vision and provide large amounts of glare and light sensitivity. Early on in this condition eyeglasses and/or soft contacts may be used. The age of onset typically begins in the second decade and can progress at varying rates throughout the individuals life. As this condition becomes more advanced rigid contact lenses are used as this rigid surface will provide a spherical surface for the individuals dynamically changing cornea. As this condition progresses the cornea will change in curvature and thickness eventually causing a 'cone' appearance to a section of the cornea. Frequent eye exams are needed to manage and monitor this condition. In very advanced cases corneal surgery may be needed, but vision correction will likely still be needed even after surgery is preformed.