Abstract
To the Editor. —The paper by Ralph Gunkel, PhD, Retinal Profiles (Archives77:22 [Jan] 1967), calls attention of the ophthalmologists to a very useful method in the study of retinal sensitivity. We have employed this method routinely for 15 years, using, as Dr. Gunkel does, a modification of the Goldmann-Weekers adaptometer. Our technique varies from Dr. Gunkel's method in that we prefer to use the horizontal retinal meridian rather than the vertical, and in that we use a two-degree test target instead of a six-minute one. For clinical applications this less critical target size has proven adequate, as may be seen from our various publications (eg,Archives60:612 [Oct] 1958;Amer J Ophth61:1044 [May] 1966). To gain a more complete picture of the retinal sensitivity we also employ the two-filter method with central fixation, following the course of dark adaptation. The two-degree test object is
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