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March 2002

How Big Is Small?

Arch Ophthalmol. 2002;120(3):406. doi:

Drs Slavin and Margulis' reference to "optic discs that are developmentally small" was unsupported by any quantitative measurements or definitions.1 In one of the largest quantitative studies, the mean disc area was found to be 2.68 mm2 (range, 0.86-5.86 mm2).2 Scientific and clinical reports, to have any value, must be precise. Merely stating that a disc is small provides no basis for corroboration or verification. The relative cup-disc ratio, by itself, is also misleading. "One must know the size of the optic disc to evaluate properly the cup-to-disc ratio or neural rim area."3(p1441)

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