title: Psychophysical estimates of optical density in human cones.
mesh_terms: D003720:Densitometry; D005425:Flicker Fusion; D006801:Humans; D010775:Photic Stimulation; D010783:Photometry; D010786:Photoreceptor Cells / Q000502:physiology*; D011601:Psychophysics; D013057:Spectrum Analysis