25-year-old female with history of acute left optic nerve head edema, now resolved. In this photo you can see a circumpapillary "high-water mark". When seen, this defines the prior extent of retinal elevation after the acute edema resolves. This artifact may take months or years to disappear.
Ophthalmic Atlas Images by EyeRounds.org, The University of Iowa are licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.