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JOEL POKORNY, VIVIANNE C. SMITH, RICHARD SWARTLEY; Threshold Measurements of Spectral Sensitivity in a Blue Monocone Monochromat. Invest. Ophthalmol. Vis. Sci. 1970;9(10):807-813.
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Threshold measurements of spectral sensitivity were obtained from a blue monocone monochromat using a foveal fixation target. The dark-adapted spectral sensitivity function could be represented by the luminosity function of the rods (CIE Cλ') weighted by xanthophyll. With a 6.2 troland (td) background the spectral sensitivity function was identical to that of the blue cones (Stiles π1 for wavelengths between 395 and 505 nm. With a 0.4-td background, a double-peaked function was obtained, representing the complete linear summation of the VCλ' function and blue cones. It is suggested that the VCλ' function obtained with a foveal fixation target is determined by cones and not rods.
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