Most colour vision defects are for red or green or both. About ten per cent of males have a colour vision defect, usually red green colour blindness as a result of a lack of red receptors.

There were five participants in the study - four male and one female - who all had normal colour vision. Three of the participants - including Prof Ng - were co-authors of the research paper.

The science behind the colours of a rainbow is a reminder of the wonders of the original quantum designer In the fifth ...

Image caption, There are many tests available to measure colour vision defects but the most common is the Ishihara Plate test In a colour vision deficiency test you are asked to identify the ...

which means that the green responsible for the colour vision defect is transmitted from the carrier mother to her son on the x- chromosome that he inherits from her - men have one x and one y ...