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Light adaptation and the luminance-response function of the cone electroretinogram

✍ Scribed by Neal S. Peachey; Kenneth R. Alexander; Deborah J. Derlacki; Gerald A. Fishman

Publisher
Springer-Verlag
Year
1992
Tongue
English
Weight
367 KB
Volume
79
Category
Article
ISSN
0012-4486

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✦ Synopsis

Cone electroretinograms are typically isolated by presenting stimulus flashes against rod-desensitizing adapting fields. To investigate the manner in which adapting-field luminance affects cone electroretinogram response properties, we measured cone electroretinogram luminance-response functions of two normal subjects, with stimuli presented against adapting fields that ranged in luminance from -1.2 to 2.1 log cd/m 2. A flicker rate of 31.1 Hz was used to isolate cone electroretinograms under all adaptation conditions. A hyperbolic equation of the form (R/Rmax): L"/(L" + K ~ was fitted to each luminance-response function by a leastsquares criterion. As adapting field luminance increased, the best-fit values of the variables K and n increased, which is in general agreement with results of electrophysiologic studies of light adaptation in retinal neurons. However, Rma x values also increased with adapting field luminance. The change in all three of these variables with adapting field luminance must be considered in the interpretation of cone electroretinogram luminance-response functions from patients with retinal disorders.

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