Bilateral optic disc coloboma with coexisting unilateral retinochoroidal coloboma in an adolescent from Northwestern Nigeria: A case report

Abstract

Optic disc coloboma is a rare congenital anomaly of the optic nerve. We report a case of bilateral optic
disc coloboma with coexisting unilateral retino choroidal coloboma in an adolescent from Northwestern
Nigeria, who presented with complaints of difficulty seeing distant objects for 3 months, associated with
ocular pains, tearing, and headache while reading. She had never worn spectacles. No previous history of
systemic illnesses or trauma. Developmental milestones were optimal for age. Ocular examination
revealed a best corrected visual acuity of 6/5 and 6/6 in the right and left eyes respectively. Dilated
fundoscopy revealed an enlarged bilateral optic disc with a white bowl-shaped excavation, absent inferior
neuro retinal rim, thin superior rim, and an area of well-defined oval retino choroidal defect, located
inferior and slightly temporal to the right optic disc. No syndromic features or any ocular complications
associated with optic disc and retino choroidal colobomas were seen.