OPTIC DISC IN FUNDUS COLOBOMA

Purpose: To categorize and describe the type of optic disc involvement and blood vessel patterns seen in patients with fundus coloboma. Meth ods: This is a prospective study involving 67 eyes of 40 patients with choroidal coloboma. The evaluation included documentation of fundus d etails using fundus drawings or photographs, or both. Results: Six typ es of disc involvement were identified: (1) normal disc outside fundus coloboma (27.8%); (2) disc outside the fundus coloboma and abnormal ( 10.4%); (3) disc outside the fundus coloboma and independently colobom atous (8.9%), (4) disc within the fundus coloboma and normal (5.0%); ( 5) disc within the Fundus coloboma and colobomatous (44.3%); and (6) d isc shape not identified but blood vessels seen emanating from the sup erior border of the large fundus coloboma (2.9%). Visual acuity was be tter in types I, II, and lII compared with IV, V, and VI. Microphthalm os was more common with the more severe anomalies. High myopia was mor e common in the less severe anomalies, Conclusion: Optic disc involvem ent: in fundus coloboma is widely variable. Oi fundus colobomas, 67.2% are associated with either a frankly colobomatous or an altered disc. Of the discs located outside fundus colobomas, 41% are also abnormal. Visual acuity was better in types I, II, and III.