Abstract
Pupillometry was used as a measure of visual sensitivity in an adult and a 4-yr-old. Photopic spectral sensitivity determined with this measure agrees with the CIE photopic visibility curve, although the 4-yr-old's data show a small long-wavelength decrement. Difference spectra for three color receptors were also measured. Three distinct functions, similar to those obtained in adults by more traditional methods, were obtained in both subjects.
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