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The human focal electroretinogram as a function of stimulus area

✍ Scribed by Pierangelo Errico; Benedetto Falsini; Vittorio Porciatti; Francesco Maria CefalÁ

Publisher
Springer-Verlag
Year
1990
Tongue
English
Weight
309 KB
Volume
75
Category
Article
ISSN
0012-4486

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✦ Synopsis

Focal electroretinograms to on-off luminance modulation(2.7 Hz) of uniform fields with a different area (144--2.25 deg 2) centered on the fovea were recorded in two young normal subjects. The electroretinogram responses typically consisted of an a-wave, a b-wave, a PIII component and a d-wave. The concentric reduction of the test field size caused progressive amplitude decrement of all components, while their response density increased. The spatial summation properties of the b-wave differed from those of the a-wave, PIII component and d-wave so that the relative contribution of the b-wave to the electroretinogram waveform depended on the stimulus area. For a critically small field size, the electroretinogram was dominated by the PIII and d-wave components. Only these two electroretinogram components displayed a density profile that could be compared with that of cone distribution.

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