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To the Editor.
—In a recent article (Archives 1980;98:865-869) entitled "Baring of the Circumlinear Vessel: An Early Sign of Optic Nerve Damage," Herschler and Osher have described a new sign of early optic disc change (baring of the circumlinear vessel), which they believe occurs before the evolution of detectable visual field deficit and predates any other previously described ophthalmoscopic criteria for glaucomatous cupping. They also state that this sign may infrequently be associated with cupping caused by optic atrophy from neurologic or retinal disease.We wish to present the case of a 46-year-old woman who has a bared circumlinear vessel in the right eye associated with a congenital optic pit. The intraocular pressure has consistently been below 20 mm Hg in both eyes and no field defect was evident in either eye. The left optic disc was normal (Figure).We believe that this case illustrates an interesting exception to the