Abstract
To investigate if a lower luminance monochromatic LED stimulus could be used as an alternative to a high luminance white light for the clinical electrooculogram. Clinical electrooculograms were recorded in color normal participants (N = 23) aged 22.6 ± 1.2years, 7 male and 16 female using the standard 100cd.m-2 white illuminant and four monochromatic LEDs with peak wavelengths of 448, 534, 596 and 634nm at 30cd.m-2. Pupils were dilated and there was a 30cd.m-2pre-adaptation to white light for 2min followed by 15min dark adaptation and 20min recording in the light stimulus using a Ganzfeld stimulator. The normalized LP:DTratio for the short wavelength LED (448nm) was equivalent in amplitude and timing to the ISCEV standard EOG (p = .99). The LP:DTratio for the white (100cd.m-2) and 448nm (30cd.m-2) were (median ± SEM): 2.49 ± .11 and 2.47 ± .11. The time to light-rise peak was also equivalent being 9.0 ± .2 and 8.0 ± .4min (p = .54). Consideration may be given to using a short wavelength monochromatic stimulus that is more comfortable for the subject than the current 100cd.m-2 illuminant.
Published Version
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