optic disc duplication

purpose: to report a case who had optic disc duplication, a rare congenital disorder characterized by two well-defined discs in one eye. case report: a 19 months-old child presented with unilateral epiphora in the right eye since birthday. the right eye was smaller than the left eye and mild ptosis was apparent. nasolacrimal duct probing was performed under general anesthesia. the examination revealed microcornea and diffuse chorioretinal coloboma in the right eye. the left eye had two well-defined optic discs with vascular anastomosis between them. orbital mri was normal. conclusion: optic disc duplication is a rare optic disc anomaly. this anomaly may be associated with chorioretinal coloboma, suggesting fetal fissure closure defect as the underlying pathogenesis. orbital imaging is warranted to differentiate true optic nerve duplication from pseudo duplication (optic disc duplication).