cone cell


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Related to cone cell: rod cell

cone cell

(kōn sel)
One of the two types of visual receptor cells of the retina, essential for visual acuity and color vision; the second type is the rod cell.

cone cell

A cell in the retina whose scleral end forms a cone that serves as a light receptor. Vision in bright light, color vision, and acute vision depend on the function of the cones. See: rod cell
See also: cell

cone cell

a cone-shaped cell sensitive to light, found throughout the retina of most vertebrate eyes but concentrated within the FOVEA (see RETINAL CONVERVENCE). Cones are concerned with discrimination of colour and with visual acuity. There are three types of cone cell, each containing a different IODOPSIN and each giving maximum response when stimulated by the blue (450 nm), green (525 nm), and red (550 nm) parts of the visible spectrum. Our perception of any given colour is produced by the relative degree to which each cone is stimulated by any given wavelength of visible light. This is in accord with the TRICHROMATIC THEORY of colour vision which suggests that all colours can be produced by the mixing of blue, green and red. Thus the brain detects a yellow light by the equal stimulation of red and green cone gells. A pigment defect in one or more of the types of cone cell can lead to COLOUR BLINDNESS.
References in periodicals archive ?
While rod cells help us see in dim or dark light, and cone cells help us see bright light and color, the loss of cone cells in particular can lead to irreversible blindness.
The cone cells, which lie at the centre of your retina, provide you with colour vision but aren't very light-sensitive.
Those tubelike cells, called Muller cells, snake through the retina, where they pair with and support light-gathering cone cells.
Our eyes work by receiving light that starts off a chain of complex chemical reactions in rod and cone cells.
The implant is especially designed for patients with retinitis pigmentosa (RP) a condition, which damages the light-sensitive rod and cone cells of the retina.
The scientists also found that many of the cone cells that were on the verge of dying before the transplant appeared to regain or retain their function.
Artificial retina Responds to light like rod and cone cells in a real retina.
Rod cells are more numerous than cone cells and are crucial for vision at night and in other low lighting conditions.
I was told that my rod and cone cells were gradually dying off and that eventually I would go blind.
Some patients also lose daylight vision and go blind completely as the color-sensing cone cells of the inner retina slowly degenerate.
Nanometer-Scale Growth of Cone Cells Tracked in Living Human Eye
London, Sep 22 (ANI): Scientists have successfully translated retinal cone cells, vital for colour vision, into blind mice.