Visual Pigments in Single Rods and Cones of the Human Retina

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Science  03 Apr 1964:
Vol. 144, Issue 3614, pp. 45-52
DOI: 10.1126/science.144.3614.45


Difference spectra of the visual pigments have been measured in single rods and cones of a parafoveal region of the human retina. Rods display an absorption maximum (λmax) at about 505 mµ associated with rhodopsin. Three kinds of cones were measured: a blue-sensitive cone with Amaxe about 450 mpf; two green-sensitive cones with Xmaa about 525 muµ; and a red-sensitive cone with λmax about 555 mµ These are presumably samples of the three types of cone responsible for human color vision.