Scotopic spectral sensitivity was measured for nine observers (aged 4. 5 months to 66 years) from 400 to 650 nm (10-nm steps) by using a 42 degree naturally viewed stimulus. The dependent measure was the visually evoked cortical-potential amplitude that was phaselocked to an 8-Hz flickering stimulus. Sensitivity was similar for all observers at middle and long wavelengths, but at short wavelengths a decrease in sensitivity with increasing age was observed. The density of the preretinal ocular media was estimated by subtracting the log scotopic spectral-sensitivity function of each observer from the human rhodopsin-absorbance spectrum when the two sets of curves were pinned at long wavelengths. The density of the infant ocular media was lower than that for adults. Optical density at 400 nm differs by about a factor of 22 between the average 1-month-old infant and the average 70-year-old adult.
|Original language||English (US)|
|Number of pages||12|
|Journal||Journal of the Optical Society of America|
|State||Published - Feb 1982|
ASJC Scopus subject areas