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Simulated double Bjerrum's scotomas by retinal pigment epithelium and receptor degeneration.

A seemingly glaucomatous double Bjerrum's nerve fiber bundle defect was mimicked by pigment epithelium and receptor degeneration. The discrepancy between normal appearance of the disc and the abnormal visual field was a clue indicating need for further evaluation for retinal disease unrelated to glaucoma. Ophthalmologists should be aware of the possibility of this cause of double Bjerrum's or ring scotoma to avoid protracted workup for nonexistent neurologic disease or treatment of glaucoma.