Gunn's dots, originally described by Marcus Gunn, are tiny white dots sometimes visible overlying the large vessels near the optic nerve or the nerve fiber layers. Their presence depends on lighting conditions, and they have no pathologic significance. They are visible reflections of the internal limiting membrane, created by the footplate of the Muller cells. The tiny white specks in these photos are best visualized at the 12:00 and 6:00 positions approximately 1 disc diameter from the optic nerve head.
Ophthalmic Atlas Images by EyeRounds.org, The University of Iowa are licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.