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 ?
Caption: Researchers have learned surprising lessons about color vision by using precisely targeted lasers (green line) to stimulate single cone cells (red, green and blue dots) in human retinas.
Unlike our cone cells, our rods are honed to see during the fading light of twilight and nighttime.
The spatiotemporal cellular operator is adaptive; this is demonstrated for the cone cells, which show transduction sensitive to lighting conditions.
"The tradeoff is that dogs generally have better night vision than people do because their cone cells and their counterparts the rod cells are distributed differently than in humans," says ophthalmologist Seth Eaton, VMD, DACVO at Cornell University Veterinary Specialists in Stamford, Conn.
"The tradeoff is that cats generally have better night vision than people do because their cone cells and their counterparts the rod cells are distributed differently than in humans," says ophthalmologist Seth Eaton, VMD, DACVO, Cornell University Veterinary Specialists in Stamford, Conn.
The mice in the study had genetic defects that killed off their rod and cone cells shortly after birth.
When you look straight at the planetary you will be using the central cone cells in your eye which, although sensitive to colour, are not particularly sensitive to faint light.
There are three types of cone cells, each sensitive to the long, medium or short wavelength of light (red, blue and green color respectively).
Color vision is enabled by the sensitivity of cone cells in the retina to electromagnetic wavelengths.
Experts believe it has potential to treat adult vision disorders involving cone cells - the most important human vision cells.
MD occurs when the layer of the retina responsible for nourishing the macula's light-sensitive rod and cone cells, and for carrying away waste products, starts to function less effectively as it ages.
Without the underlying carpet of RPE cells, the rod and cone cells that respond to light cannot survive