cone cell

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Related to Cone cells: Rods and cones

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 ?
The transcription factor Nr2e3 functions in retinal progenitors to suppress cone cell generation.
Because the eye is constantly jiggling, the researchers had to determine the pattern of the eye movements to predict where cone cells would be several milliseconds in the future.
"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.
Cats have "low-resolution" vision when compared to people because they have a proportionately lower number of what are called cone cells in their retinas--the light-sensitive layer at the back of the eye.
During hyperpolarization in nonsaturating light, the partial current suppression caused by intracellular cGMP reduction will be counteracted by the increase in the residual cGMP-gated current caused by its inward rectification properties, which will ultimately reduce the voltage response to light of the cone cells. We showed that a similar (see the y parameter in Table 1), although, less evident inward rectification property is also present in photoreceptors in nocturnal geckos.
The result is defects of the light-sensitive pigment in the retina's cone cells that distinguish colour.
The different wavelengths of light activate the cone cells at the back of the eye which pass the message to the brain.
Like several other types of retinal neurons, cone cells develop into what is known as a "mosaic" because there is a degree of regular spacing between the cone cells of specific type, for example, red cones.
AAQ binds to ion channels in retina cells and alters the flow of ions in response to light, mimicking how normal rods and cone cells react to light and activate neurons.
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.