The occurrence of a congenital slit-like pupil, also referred to as "cat pupil" is rare. One or both pupils may be elongated, oval, or form a vertical, horizontal, or oblique slit. Although reports on this deformity have been published before,1,2 the etiology of slitlike pupil has been the subject of much speculation, since most of the previous observations were made before gonioscopy became an office procedure. The anatomical conditions leading to the deformity of the pupil, however, become obvious on gonioscopic inspection of the chamber angle and will be illustrated in this report of a child with cerebellar hypoplasia, hydrocephalus, and bilateral pupillary anomalies.
Report of Case
The patient was referred to the Pediatric Department of the State University of Iowa College of Medicine at the age of 11 months for a neurological disorder. Except for preeclampsia in the first and the last trimester of pregnancy, the birth history
VON NOORDEN GK, BALLER RS. The Chamber Angle in Split-Pupil. Arch Ophthalmol. 1963;70(5):598–602. doi:10.1001/archopht.1963.00960050600004
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