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Article
March 1932

WAYS IN WHICH DISTANCE OF THE TEST FIELD AFFECTS DETERMINATIONS OF RETINAL SENSITIVITY

Author Affiliations

BALTIMORE
From the Research Laboratory of Physiological Optics, Wilmer Ophthalmological Institute, Johns Hopkins Medical School.

Arch Ophthalmol. 1932;7(3):383-388. doi:10.1001/archopht.1932.00820100037006
Abstract

Determinations of achromatic and chromatic sensitivity are affected by such factors as breadth of pupil, size of test field, state of adaptation of the eye, brightness of the preexposure and surrounding field and distance of the test field. That the distance of the test object affects acuity has been at least fairly well known to ophthalmologists and workers in physiologic optics for many years, but that it has an important or considerable influence on retinal sensitivity has received little attention other than what is implied in the control and specification of distance as one of the conditions of work.

It would seem that the possibilities of change of distance of the object or stimulus influencing the intensity of the retina's response may be summed up in the following effects : change in the size of the image, change in the light density of the image and change in the distance

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