Walsh & Hoyt: Doubling of the Optic Disc

Doubling of the optic discs is a rare anomaly in which two optic discs are seen ophthalmoscopically and presumed to be associated with a duplication or separation of the distal optic nerve into two fasciculi (403). Collier (404) described a case and reviewed eight such reports in the literature. Although these anomalies varied considerably, most had a ‘‘main'' disc and a ‘‘satellite'' disc, each with its own vascular system (Fig. 3.27). Most cases occur unilaterally and are associated with decreased acuity in the affected eye (403). Since Collier's report, several other cases have been reported which appear to represent ‘‘pseudodoubling'' of the optic disc (403,405-411).