<prompt> In the most refractive eyes the peak sensitivity of retinal rods and cones pigment is?260 and 500 respectively460 and 480 respectively398 and 550 respectively498 and 555 respectively  <response>: Ans. d 498 and 555 respectively. Adlers Physiology of the Eye 11thPg.529 Peak sensitivity for cones 555 nm, but combination of R, B, and G cones cones short wavelength - 420, cones middle wavelength - 534, and cones long wavelength 564. Peak sensitivity for rods 498 nm.FUNCTIONALLY THERE ARE TWO SEPARATE RETINAS:Night retinaDay retinaRodsConesNo colorComplete colorLow acuity fovea blindHigh acuityScotopic or mesopic with luminance 3 cdm2Photopic Photoreceptor density - Because rods and cones have different spectral sensitivities and different absolute sensitivities to light, the visual response is not the same over the retina.- Rods -130,000,000.- Cones - 7,000,000. Cones are concentrated in the fovea and receptive fields are small in this region. Rods are absent in macula leutea Yellow pigment.Adaptation Cones adapt more rapidly than rods. Cones regain complete sensitivity in 10-12 minutes. Rods regain complete sensitivity in 30-60 minutes 