Having used the ophthalmoscope rather industriously in large eye clinics and in private practice for the past twenty-one years, I have been strongly impressed by the oft-repeated occurrence of a certain aberrant picture of the optic nerve entrance. Roughly estimated, the total number of well-marked examples of such anomalous optic papillæ that I have encountered is about sixty—seen in the eyes of perhaps forty individuals—or about one in every 1,000 persons.
This I consider an extremely conservative estimate, as I believe the number to be greater.
The most distinctive feature of the appearance in question is an apparent wide parting in the optic nerve fibers at the temporal side, or a sort of triangular cleft, outward, of the cortical portion of the nerve head. Briefly described, the condition and accompanying phenomena manifest the following peculiarities: The gray pink color of the disc is
BEARD CH. TEMPORAL CLEFT OF THE NERVE HEAD.. JAMA. 1905;XLIV(2):93–94. doi:10.1001/jama.1905.92500290013001c
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