Ishihara's color perception test charts are recognized internationally as highly reliable method of determining color deficiency. With normal color perception,

The original Ishihara color blindness test was introduced in early last century and since then, it is by far the most well known color vision deficiency test al

This Color Blindness book with Ishihara style plates for color perception vision testing perfect for Optometrists and eye doctors who want to test color vision

COLORBLINDNESS/COLOURBLINDNESS/COLOR BLINDNESS/COLOUR BLINDNESS/ Accepted by leading authorities as a simple and accurate method for discovering congenital colo