Colobomatous cupping of the optic disc.

Coloboma confined to the optic disc is a relatively rare condition (Steinberg, 1943), and has been described as unilateral in the majority of cases (Duke-Elder, I964; FranSois, I964). However, manifestation of the deformity may occur in the other eye (Hughes, 1947), and a number of bilateral cases have now been described. This paper records another bilateral case. A 35-year-old man was found to have defective vision in the right eye at a routine medical examination and was referred for ophthalmic examination. He gave a history of poor vision in the right eye since childhood, and of having first been seen by a doctor at the age of 23 when living in India. He was told that he had a "lazy eye" for which no treatment could be given. There was no previous history of ocular trauma and no relevant medical history. A family history was not available.