SD-VS-CBCCT

Cambridge Colour Test

Category:

Description

The Cambridge Colour Test for ViSaGe provides a rapid means of screening subjects for colour vision deficiencies. It can also be used to examine in more detail the changes in colour discrimination that occur as a result of congenital or acquired conditions. The test was developed by Professor John Mollon and his colleagues (Department of Experimental Psychology, University of Cambridge) and determines discrimination ellipses in colour deficient subjects by probing chromatic sensitivity along the colour confusion lines. Ellipses measured in individuals with even slightly anomalous colour vision are characteristically orientated and enlarged. The test is an ideal tool for monitoring quantitatively over time the progression or remission of disease. Many drugs affect colour vision and pharmacologists will find the test well suited to monitoring the short-term or long-term course of such side-effects.

Investigate the limits of colour discrimination:
The Cambridge Colour Test provides a rapid means of screening subjects for colour vision deficiencies; but it also can be used to examine in more detail the changes in colour discrimination that occur as a result of congenital or acquired conditions. It allows the investigator to monitor quantitatively over time the progression or remission of disease. Many drugs affect colour vision and the pharmacologist will find the test well suited to monitoring the short-term or long-term course of such side-effects.

The test determines discrimination ellipses in colour deficient subjects by probing chromatic sensitivity along the colour confusion lines. Ellipses measured in individuals with even slightly anomalous colour vision are characteristically orientated and enlarged (see references).

Easy to use:
The procedure is easy to use for both the investigator and the subject. It uses the familiar Landolt C stimulus, defined by the two test colours that are to be discriminated, on an achromatic background.

The Cambridge Colour test uses the proven concept of introducing spatial and luminance noise into the stimulus, which is composed of grouped circles randomly varying in diameter and having no spatial structure. The Landolt C is therefore defined by chromaticity alone, ensuring that the subject’s responses are not due to luminance or spatial cues in the stimulus, and thus avoiding the necessity for a preliminary procedure to find isoluminance for the test colours.

The test is conceptually very simple to explain to the sub