Visual Pigment Density in Single Primate Foveal Cones

Science  19 Dec 1969:
Vol. 166, Issue 3912, pp. 1508-1510
DOI: 10.1126/science.166.3912.1508


The feasibility is demonstrated of microspectrophotometric studies on primate photoreceptors aligned at right angles to the test beam, rather than axially illuminated. Pigment densities, and hence absorption per unit thickness, are approximately equal in primate rods and foveal cones. These pigment densities are similar to those reported for frog rods and fish cones.