The Directional Sensitivity of the Retina and the Spectral Sensitivities of the Rods and Cones

摘要: It is now well established that light rays of the same spectral character and physical intensity entering eye through different points pupil may produce visual impressions which differ in brightness colour even though patch retina stimulated (the fovea) kept same. Rays terminating on point are incident directions. Also, they have traversed paths refractive media suffered losses by absorption, scattering or reflexion. has been shown, however, differences do not account for observed variations response, must therefore be attributed to reaction it directions or, briefly, a directional sensitivity retina. Further evidence this so given later paper (p. 81).