Abstract
Spectral sensitivities and results of clinical colour tests were obtained for a 28-year-old male who exhibited a complete absence of colour perception, normal visual acuity, no nystagmus and no photophobia. Increment-threshold spectral sensitivities showed multiple peaks, suggesting the presence of more than one photopigment in the middle to long wavelength region. The absolute values of the increment-threshold spectral sensitivities were lower than those in individuals with normal colour vision, with a marked sensitivity loss at short wavelengths, suggesting reduced or complete absence of the short wavelength sensitive cones. Spectral sensitivity to rapid flicker (25 Hz) was spectrally broad, indicating the presence of more than one cone type in the middle and long wavelengths, but again with reduced sensitivity.
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