Isolated congenital megalocornea

Isolated congenital megalocornea is an inherited eye disorder in which the cornea of the eye is enlarged from birth. The cornea in both eyes is greater than 13 mm wide, and it is not due to an increase in eye pressure. Features of megalocornea include astigmatism, decreased iris pigment (atrophy of the iris stroma), contraction of the pupil (miosis), iris tremors (iridodonesis), and dislocation of the lens. Most people with megalocornea have normal eye function, although some people can develop cataracts or glaucoma. In about 90 percent of cases, the condition is inherited in an X-linked recessive pattern. Treatment may include correcting vision with eyeglasses or contact lenses and regular exams to check for cataracts and glaucoma.