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January 16, 1937

Topography of the Layer of Rods and Cones in the Human Retina

JAMA. 1937;108(3):232. doi:10.1001/jama.1937.02780030070033

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This book is another of the excellent series of monographs on ophthalmologic subjects that have appeared from the eye clinics of the Scandinavian countries. It begins with a historical review of the literature on the results of the earlier investigations on the form and number of rods and cones. An introduction discusses the errors of the various methods of fixation, embedding, sectioning and counting. Finally the estimation of the number of rods and cones per square millimeter at measured distances from the macula is recorded. The center of the fovea contains 147,300 cones per square millimeter. The so-called rod line 130 microns from the center of the fovea shows 74,800 rods per square millimeter. A minimum of 3,300 cones per square millimeter is found 10 mm. temporally from the center. The rods begin 130 microns from the foveola. About 5.5 mm. from the center there is an annular zone containing

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