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Reading-evoked visual dimming
R S Manor1, Y Yassur, W F Hoyt
1Department of Ophthalmology, Beilinson Medical Center, Sackler Faculty of Medicine, Tel-Aviv University, Petah-Tikva, Israel.
Purpose:
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.
Methods:
Computed tomography and magnetic resonance imaging were performed.
Results:
An orbital apex intraconal tumor situated laterally to and above the optic nerve was found.
Conclusions:
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.