• The concept of a circumlinear vessel (CLV) of the optic disc was recently introduced into the opthalmic literature, and baring of the CLV was suggested as a sign of acquired disc injury, especially from glaucoma. In a review of fundus photographs of 27 eyes with optic nerve pits, only one eye was found in which the CLV was bared. This observation supports the concept that baring of the CLV is a sign of acquired disc change.
Dieckert JP, Pruett RC. Optic Nerve Pit and Baring of the Circumlinear Vessel. Arch Ophthalmol. 1983;101(11):1704–1705. doi:10.1001/archopht.1983.01040020706007
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