colour vision


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Related to colour vision: color vision, colour blindness

colour vision

the ability of some animal groups to detect colour in an object, which is due in vertebrates to the activity of CONE CELLS in the retina of the eye. According to the TRICHROMATIC THEORY of colour vision, our perception of a multitude of colours is made possible by differential stimulation of only three types of cone cell, each containing a different coloured pigment (see IODOPSIN). Examples of animals with colour vision include primates, many fishes, and most birds and insects. Animals without colour vision probably see objects in shades of grey (monochrome vision).
References in periodicals archive ?
The X-Chrom lens and the ChromaGen lens system are two commercially available coloured filters that have been prescribed to improve the colour vision of daltonians.
09 What is one of the main limitations of the colour vision test that comprises the plate shown in Image C?
After the researchers took into consideration other factors such as men's weight, cholesterol, blood sugar levels and other eye diseases, they found that as blood pressure values rose, the odds of having impaired colour vision increased as well.
An Ishihara colour test consisting of a series of pictures of coloured spots is the test most often used to diagnose red-green colour deficiencies, with a shape or number embedded in the picture and which can be seen with normal colour vision but not with a colour defect.
More than 95 per cent of all variations in human colour vision involve the red and green receptors in male eyes and it is very rare for males or females to be 'blind' to the blue end of the spectrum.
Opinion Poll came from further back with a big challenge under Mickael Barzalona but former Mark Johnston inmate Colour Vision held on by half a length.
Opinion Poll came from further back with a big challenge but Colour Vision held on.
After coming third in both the Cesarewitch and in the Long Distance Cup on Champions Day last season, most expected Colour Vision to have been in need of the outing in the Sagaro Stakes.
The same, of course, could soon be said about Colour Vision, but he is two years younger than both Fame And Glory and Opinion Poll and is very much the curve-ball contender in this field.
Colour Vision travelled really well last time out and looks a real improver.
OPINION Poll has serious competition to be Godolphin's number one stayer after Colour Vision announced his arrival to the team in stunning fashion in the Blue Square Levy Board Sagaro Stakes at Kempton.
Visual colour dominates society, from the feed-pipes that keep the municipal park green to the healing hues you view to cure illness, to a social hierarchy based upon one's limited colour vision.