Reading-evoked visual dimming.

Abstract

To carry out a neuroradiologic investigation in a monocular 49-year-old patient who during the past five years described symptoms of dimming of central vision in his left eye, which was provoked only by reading. Computed tomography and magnetic resonance imaging were performed. An orbital apex intraconal tumor situated laterally to and above the optic nerve was found. Reading-evoked visual dimming can be a variant of gaze-evoked amaurosis. The optic nerve displaced laterally and superiorly, and stretched by the act of reading, may be compressed between the tumor above and the contracted inferior rectus muscle inferiorly.