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Article
May 1940

NEW METHOD OF SUBJECTIVE REFRACTION INVOLVING IDENTICAL TECHNICS IN STATIC AND IN DYNAMIC TESTS

Author Affiliations

CLEVELAND
From the Lighting Research Laboratory, General Electric Company.

Arch Ophthalmol. 1940;23(5):941-956. doi:10.1001/archopht.1940.00860131065006
Abstract

The technics and data which are presented here are those which follow from the specific introduction of brightness-contrast as a criterion of visibility into certain phases of subjective refraction. This criterion is not only a fundamental one in physiologic optics but a unique one from the point of view of refraction, since it permits the functioning of convergence in the absence of a stimulus for relative accommodation. Furthermore, the procedures for determining the refractive states of the eyes at the near point are precisely the same as those used for determining the refractive states at the far point. Although the clinical data presented are exploratory rather than conclusive, the results obtained suggest certain new concepts related to the functioning of the mechanisms of accommodation. They also suggest diagnoses of certain conditions which have been difficult when considered from the usual tenets of ocular examination.

VISUAL THRESHOLDS AND VISIBILITY  Throughout this

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