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(Investigative Ophthalmology and Visual Science. 1971;10:971-978.)
© 1971 by The Association for Research in Vision and Ophthalmology, Inc.

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The Retinal Response to Sinusoidal Variations in Light Intensity at Very Low Frequency

J. LEVETT 1

1 Department of Biomedical Engineering, Rush-Presbyterian-St. Luke's Medical Center, and Bioengineering Program, University of Illinois at Chicago Circle, Chicago, Ill.

The frog retinal response to light is obtained in the frequency domain. The response is obtained by means of a capillary-type electrode at the cornea. Sinusoidal stimuli are used. The very low frequency range (0.01 to 1 Hz.) is examined. With decreasing frequency, retinal gain increases and the response is more nearly sinusoidal. The increase in sensitivity is thought to result from rod enhancement. The linear-nonlinear-linear transition occurring over the entire bandwidth of the frog retinal system is explained in terms of a two-component model.

Key Words: retinal response • sinusoidal variations • low-frequency light intensity • steady-state ERG

Submitted on June 30, 1971
Accepted on October 4, 1971






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