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Differential Threshold Measurements on the Light Reflex of the Human Pupil

Differential Threshold Measurements on the Light Reflex of the Human Pupil Abstract 1. Introduction Before discussing the threshold of the pupil reflex, it seems necessary to state that its value depends mainly on intrinsic qualities of the individual nervous system and, in some degree, on the mechanical properties of the iris tissue.We know very little about those nervous factors, but it is a fact, common to the clinician and confirmed by experiments, that some persons require a much higher energy of light to respond with a contraction of their pupils than do others, while in abnormal circumstances, as, for example, in Adie's syndrome, the insensitivity of the pupil to light stimulation is pathognomonic.As to the iris tissue, it seems probable that the amplitude of contraction and therefore its apparent threshold is smaller in old than in young persons at any given amount of stimulation, owing to sclerotic changes in the mesodermal tissue layers of the iris.It is evident that References 1. Schweitzer, N. M. J., and Bouman, M. A.: Threshold Measurements on the Light Reflex of the Pupil , Ophthalmologica 132:286-288, 1956.Crossref 2. Schweitzer, N. M. J.: Threshold Measurements on the Light Reflex of the Pupil in the Dark Adapted Eye , Docum. ophth. 10:1-78, 1956. 3. Harms, H.: Grundlagen, Methodik und Bedeutung der Pupillenperimetrie , von Graefes Arch. Ophth. 149:1-66, 1949.Crossref 4. Bouman, M. A.: Peripheral Contrast Thresholds for Various and Different Wavelengths for Adapting Field and Test Stimulus , J. Optic. Soc. America 42:820-831, 1952.Crossref 5. Bouman, M. A., and Van der Velden, H. A.: The Two Quanta Hypothesis as a General Explanation for the Behaviour of Threshold Values and Visual Acuity for the Several Receptors of the Human Eye , J. Optic. Soc. America 38:570-581, 1948.Crossref http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png A.M.A. Archives of Ophthalmology American Medical Association

Differential Threshold Measurements on the Light Reflex of the Human Pupil

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References (5)

Publisher
American Medical Association
Copyright
Copyright © 1958 American Medical Association. All Rights Reserved.
ISSN
0096-6339
DOI
10.1001/archopht.1958.00940050097012
Publisher site
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Abstract

Abstract 1. Introduction Before discussing the threshold of the pupil reflex, it seems necessary to state that its value depends mainly on intrinsic qualities of the individual nervous system and, in some degree, on the mechanical properties of the iris tissue.We know very little about those nervous factors, but it is a fact, common to the clinician and confirmed by experiments, that some persons require a much higher energy of light to respond with a contraction of their pupils than do others, while in abnormal circumstances, as, for example, in Adie's syndrome, the insensitivity of the pupil to light stimulation is pathognomonic.As to the iris tissue, it seems probable that the amplitude of contraction and therefore its apparent threshold is smaller in old than in young persons at any given amount of stimulation, owing to sclerotic changes in the mesodermal tissue layers of the iris.It is evident that References 1. Schweitzer, N. M. J., and Bouman, M. A.: Threshold Measurements on the Light Reflex of the Pupil , Ophthalmologica 132:286-288, 1956.Crossref 2. Schweitzer, N. M. J.: Threshold Measurements on the Light Reflex of the Pupil in the Dark Adapted Eye , Docum. ophth. 10:1-78, 1956. 3. Harms, H.: Grundlagen, Methodik und Bedeutung der Pupillenperimetrie , von Graefes Arch. Ophth. 149:1-66, 1949.Crossref 4. Bouman, M. A.: Peripheral Contrast Thresholds for Various and Different Wavelengths for Adapting Field and Test Stimulus , J. Optic. Soc. America 42:820-831, 1952.Crossref 5. Bouman, M. A., and Van der Velden, H. A.: The Two Quanta Hypothesis as a General Explanation for the Behaviour of Threshold Values and Visual Acuity for the Several Receptors of the Human Eye , J. Optic. Soc. America 38:570-581, 1948.Crossref

Journal

A.M.A. Archives of Ophthalmology – American Medical Association

Published: Apr 1, 1958

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