Bilateral congenital mydriasis in a child case.

Congenital mydriasis is defined as congenital absence of iris sphincter muscle which occurs rarely and shows autosomal dominant inheritance (1-4). It was described by White and Fulton (2) in 1937 for the first time. Fixed and dilated pupil is present from the time of birth, observed more frequently in girls and typically bilateral (1-4). Iris sphincter traumas, pharmacological dilatation and acquired neurological disorders should be excluded in these patients.