the cones in the eye are located in the retina.
the cones in the eye are located in the retina.
where are the cones in the eye located?
in the retina
the ability of the [[human eye]] to distinguish colors is based upon the varying sensitivity of different cells in the [[retina]] to light of different [[wavelengths]]. humans are [[trichromacy|trichromatic]]—the retina contains three types of color receptor cells, or [[cone cell|cones]]. one type, relatively distinct from the other two, is most responsive to light that is perceived as blue or blue-violet, with wavelengths around 450 [[nanometre|nm]]; cones of this type are sometimes called "short-wavelength cones", "s cones", or "blue cones". the other two types are closely related genetically and chemically: "middle-wavelength cones", "m cones", or "green cones" are most sensitive to light perceived as green, with wavelengths around 540 nm, while the "long-wavelength cones", "l cones", or "red cones", are most sensitive to light is perceived as greenish yellow, with wavelengths around 570  nm.
color
the color yellow, for example, is perceived when the l cones are stimulated slightly more than the m cones, and the color red is perceived when the l cones are stimulated significantly more than the m cones. similarly, blue and violet hues are perceived when the s receptor is stimulated more. cones are most sensitive to light at wavelengths around 420 nm. however, the lens and cornea of the human eye are increasingly absorptive to shorter wavelengths, and this sets the short wavelength limit of human-visible light to approximately 380 nm, which is therefore called 'ultraviolet' light. people with aphakia, a condition where the eye lacks a lens, sometimes report the ability to see into the ultraviolet range. at moderate to bright light levels where the cones function, the eye is more sensitive to yellowish-green light than other colors because this stimulates the two most common (m and l) of the three kinds of cones almost equally. at lower light levels, where only the rod cells function, the sensitivity is greatest at a blueish-green wavelength.
cone cell