This obstacle, a gradual thinning of the cornea, the United States the most common corneal dystrophy that affects every American in 2000. This is more common in adolescents and adults 20 years old. When the corneal thinning in keratoconus gradually bulge outward, forming a circular cone shape. This abnormal curvature changes the cornea's refractive power, producing moderate to severe distortion (astigmatism) and the fuzzy images (myopia) perspective. Keratoconus may also cause swelling and scar tissue of the visual impairment.
Studies have shown that keratoconus from one of several possible reasons stem:
* The inheritance of corneal abnormalities - conditions on the 7 per cent and have a family history of keratoconus.
* For the ocular trauma - friction or wear contact lenses eye over many years of efforts, and direct injury to the eyes.
* Certain eye diseases - such as retinitis pigmentosa, retinopathy of premature children and vernal conjunctivitis.
* Systemic diseases such as Leber's congenital amaurosis - Ehlers, Danlos syndrome, Down syndrome and osteogenesis imperfecta.
Keratoconus usually affects both eyes. At first, people can correct their vision with glasses. However, astigmatism worse, they must rely on specially equipped with contact lenses to reduce distortion and provide a better view. Although finding a comfortable contact lens can be a very frustrating and difficult process, it is crucial, because a shot further damage to the cornea may not be appropriate to wear contact lenses can not be tolerated.
Cornea, never will cause serious vision problems a few years. But in about 10-20% of people with keratoconus, corneal scars will eventually become, or will not tolerate a contact lens. If one of these problems occur, you may need corneal transplants. This action is successful in more than 90 percent with advanced keratoconus. Several studies have also reported that 80% or more of these patients 20/40 vision or better after surgery.