THE DARK ADAPTATION OF THE COLOR ANOMALOUS

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Abstract
Dark adaptation measurements using red and violet test lights were made with a Hecht-Shlaer Adaptometer under 3 conditions: (1) 3[degree] light viewed 7[degree] temporally, (2) 1/2[degree] light viewed centrally, and (3)1/2[degree] light viewed 7[degree] temporally. Violet dark adaptation curves for protanopic and protanomal-ous subjects are normal. For the same subjects, red dark adaptation curves measured 7 [degree] peripherally with the 3 [degree] light reach an initial plateau about l1/2 log units above the normal thresholds to red light during the first 12 mins., show a 2d decrease from 12-22 mius., and form a 2d plateau with normal threshold values from 22-40 mins. Foveal thresholds meas-ured with the 1/2[degree] red light reach a level about 11/2 log units above normal during the first 8 or 9 mins. and do not change thereafter. Peripheral measurements with the 1/2[degree] red light resemble those made with the 3 [degree] red light except that the terminal thresholds from 22-40 mins. remain about 1/2 log unit above the normal values. Red and violet dark adaptation curves for deuteranopic and deuteranomalous subjects are indistinguishable from those for color normal subjects under all the above conditions.

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