Ishihara Colour Blindness Test app analytics for January 9

The Ishihara test is a color perception test for red-green color deficiencies, the first in a class of successful color vision tests called pseudo-isochromatic plates. It was named after its designer, Dr. Shinobu Ishihara, a professor at the University of Tokyo, who first published his tests in 1917. This app should not be used for diagnosis, please consult your medical professional for further testing and information.