Useful article about colourblindness (Colour vision deficiency) from the NHS

The NHS have useful information on their website about colourblindness, including information on; an explanation of what it is; types and symptoms of colour vision deficiency; tests for colour vision deficiency; issues for people with a colour vision deficiency; causes of colour vision deficiency; how colour vision deficiency is inherited. The NHS page can be found here: https://www.nhs.uk/conditions/colour-vision-deficiency/