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HARVEY A. LINCOFF, MD

Arch Ophthalmol. 1965;73(4):502-505.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

Introduction

The value of double simultaneous stimulation in perimetry was noted by Bender¹ in 1950. The technique is based on the principle of the extinction phenomenon which was already being used by neurologists to test other sensory modalities. Harrington and Flocks² employed this principle in the perimetric screen which they developed in 1955. The purpose of double simultaneous stimulation is to increase the sensitivity of testing of opposite fields. While the individual subject with early hemianoptic depression may perceive a single stimulus on either side of the vertical meridian, when the stimulus is presented simultaneously to either side there occurs an extinction of the stimulus on the diseased side.

Description of Instrument

In order to test for this we have made an instrument which projects two lights simultaneously. It consists of two flashlights of the kind used by lecturers as a pointer to project a small, focused spot . . . [Full Text PDF of this Article]

Author Affiliations
New York

From the Department of Surgery (Ophthalmology) of the New York Hospital Cornell Medical Center.

Footnotes
Submitted for publication July 6, 1964.

Reprint requests to 440 E 57th St, New York 10022.

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