<prompt> Appreciation of color is function of?RodsConesBothNone  <response>: Ans. b Cones. Ref. Parsons, Disease of Eye, 19th 131; Khurana 3rd 250; Ganong, Physiology, 21st 166COLOR VISION Sensation of any colour is determined by the relative frequency of impulses for cone system The appreciation of colors is function of cones and occurs in photopic vision. Normal color vision is trichromatic, the basis of Young Helmotz theory of colour vision. Other theories of color vision are:- Hering or Hurvich and James Law trichromatic signal from cones fed into subsequent neural stage and exhibit spectral apponent and spectral non-opponent property, and- Edwin land wavelength theory. Cones are photoreceptors tightly packed in fovea centralis where there are no rods and other layers of retina are very thin here. Central part of fovea constitutes of cones and their nuclei largely; all other retinal layers are absent. 