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#009:Ishihara
"Did you know that...fifteen percent of men are colourblind?"
This Ishihara colour test is a test for red-green colour deficiencies. It was named after its designer, Dr. Shinobu Ishihara (1879-1963), a professor at the University of Tokyo, who first published his tests in 1917. The test consists of a number of coloured plates, each of which is printed with a circle made of many different sized dots of slightly different colours spread in a random manner. Within the dot pattern, and distinguishable only by colour (not, for example, by shape), is a number. The number that a person can see on the plate will reveal whether or not they are colour blind, and if so, what type of colour blindness they posess. The full test consists of thirty-eight plates, but the existence of a deficiency is usually clear after no more than four plates. Common plates include a circle of dots in shades of green and light blues with a figure differentiated in shades of brown. Others feature a circle of dots in shades of red, orange and yellow with a figure in shades of green. The former tests for protanopia, and the second for deuteranopia. Courtesty Wikipedia
Strange affliction, isn't it? Stranger still is that less than one percent of women are colourblind. Anyway, there's a number in the image above. What is it?
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