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(Investigative Ophthalmology and Visual Science. 1971;10:247-251.)
© 1971 by The Association for Research in Vision and Ophthalmology, Inc.

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Photoelectric Plethysmography

Ocular Blood Flow Measurements in Dogs

ROBERT E. CHRISTENSEN 1, IRVING POSALSKI 1, RICHARD WONG 1, and HAROLD WEISMAN 1

1 Jules Stein Eye Institute, UCLA School of Medicine, Los Angeles, Calif.

Ocular blood flow in dogs was monitored with the use of a specially designed photoelectric plethysmograph transducer. The ocular pulse waves demonstrated were (1) of low amplitude, (2) coincident with cardiac systole, and (3) rapidly affected by stimuli known to influence cerebral blood flow. Changes in ocular pulse amplitude correlated with concurrent blood gas analyses (arterial pCO2 and pO2). Hypercarbia and hypoxia increase the ocular pulse amplitude, while hypocarbia and hyperoxia decrease the ocular pulse amplitude. Variations in ocular pulse amplitude measured by photoelectric plethysmography may mirror changes in cerebral and ocular blood flow.

Key Words: ocular pulse • photoelectric transducer • reflectance photometry • ocular blood flow • ocular plethysmography • carotid and cerebral blood flow

Submitted on January 28, 1971
Accepted on March 9, 1971






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Copyright © 1971 by the Association for Research in Vision and Ophthalmology