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EFFECT OF A PRISM ON THE CORNEAL LIGHT REFLEX

EFFECT OF A PRISM ON THE CORNEAL LIGHT REFLEX Abstract ONE IS accustomed to think of a prism as a wedge-shaped piece of glass which bends a ray of light traversing it in the direction of its base. That this ray of light affects the position of the corneal light reflex in a paradoxic manner is not generally known. Displacement of a corneal light reflex from a fixational position is known to indicate ocular deviation, and any artificial method which could restore such displacement to a fixational position can likewise serve to register the amount of such deviation. Such artificial restoration by binocular instruments employing flexibly moving lighted targets through a measured range is established practice. That a corrective prism could likewise restore a displaced corneal light reflex to a fixational position was noted by me in a previous report.1 Maddox,2 in his excellent treatise entitled "The Clinical Use of Prisms," devoted a chapter to the internal reflection References 1. Krimsky, E.: The Fixational Corneal Light Reflex as an Aid in Binocular Investigation , Arch. Ophth. 30:505-521 ( (Oct.) ) 1943.Crossref 2. Maddox, E.: The Clinical Use of Prisms , London, John Wright & Sons, Ltd., 1893. 3. Cowan, A.: Ophthalmic Optics , Philadelphia, F. A. Davis Company, 1927. 4. Wood, C. A.: The American Encyclopedia and Dictionary of Ophthalmology , Chicago, Cleveland Press, 1916, vol. 8, p. 6174. 5. Thorington, J.: Prisms: Their Use and Equivalents , Philadelphia, P. Blakiston's Sons & Co., 1913. 6. Hardy, L. H.: Clinical Uses of Ophthalmic Prisms (Metric) , Arch. Ophth. 34:16-23 ( (July) ) 1945.Crossref 7. Krimsky, E.: The Cardinal Anglometer , Arch. Ophth. 26:670-674 ( (Oct.) ) 1941.Crossref 8. Krimsky, E.: Modification of the Brewster Stereoscope for Clinical Requirements , Arch. Ophth. 26:808-815 ( (Nov.) ) 1941.Crossref http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Archives of Ophthalmology American Medical Association

EFFECT OF A PRISM ON THE CORNEAL LIGHT REFLEX

Archives of Ophthalmology , Volume 39 (3) – Mar 1, 1948

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References (8)

Publisher
American Medical Association
Copyright
Copyright © 1948 American Medical Association. All Rights Reserved.
ISSN
0003-9950
eISSN
1538-3687
DOI
10.1001/archopht.1948.00900020358010
Publisher site
See Article on Publisher Site

Abstract

Abstract ONE IS accustomed to think of a prism as a wedge-shaped piece of glass which bends a ray of light traversing it in the direction of its base. That this ray of light affects the position of the corneal light reflex in a paradoxic manner is not generally known. Displacement of a corneal light reflex from a fixational position is known to indicate ocular deviation, and any artificial method which could restore such displacement to a fixational position can likewise serve to register the amount of such deviation. Such artificial restoration by binocular instruments employing flexibly moving lighted targets through a measured range is established practice. That a corrective prism could likewise restore a displaced corneal light reflex to a fixational position was noted by me in a previous report.1 Maddox,2 in his excellent treatise entitled "The Clinical Use of Prisms," devoted a chapter to the internal reflection References 1. Krimsky, E.: The Fixational Corneal Light Reflex as an Aid in Binocular Investigation , Arch. Ophth. 30:505-521 ( (Oct.) ) 1943.Crossref 2. Maddox, E.: The Clinical Use of Prisms , London, John Wright & Sons, Ltd., 1893. 3. Cowan, A.: Ophthalmic Optics , Philadelphia, F. A. Davis Company, 1927. 4. Wood, C. A.: The American Encyclopedia and Dictionary of Ophthalmology , Chicago, Cleveland Press, 1916, vol. 8, p. 6174. 5. Thorington, J.: Prisms: Their Use and Equivalents , Philadelphia, P. Blakiston's Sons & Co., 1913. 6. Hardy, L. H.: Clinical Uses of Ophthalmic Prisms (Metric) , Arch. Ophth. 34:16-23 ( (July) ) 1945.Crossref 7. Krimsky, E.: The Cardinal Anglometer , Arch. Ophth. 26:670-674 ( (Oct.) ) 1941.Crossref 8. Krimsky, E.: Modification of the Brewster Stereoscope for Clinical Requirements , Arch. Ophth. 26:808-815 ( (Nov.) ) 1941.Crossref

Journal

Archives of OphthalmologyAmerican Medical Association

Published: Mar 1, 1948

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