glaucomatous halo

n.

A yellowish ring surrounding the optic disk, indicating atrophy of the choroid in glaucoma.
A circle of illumination seen around lights, caused by corneal edema in glaucoma.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.