Congenital Optic Disc Anomaly
In this eye, the optic disc is pathologically elevated above the retinal surface. It lacks a physiologic cup, and its margins are slightly blurred. The signs depicted here are caused by a congenital optic disc anomaly, leading to overcrowding of axons as they exit the eye.
It is often difficult to tell the difference between a congenital optic disc anomaly and , an acquired swelling of optic nerve axons caused by increased intracranial pressure, infarction, or inflammation of the optic nerve.