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Topic: Ishihara colour test

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	Ishihara colour test -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-16)
		The Ishihara colour test is a test for (Genetic inability to distinguish differences in hue) colour blindness.
		It consists of a number of coloured plates, on each plate is printed a circle made of many different sized dots of slightly different colours, spread in a random manner.
		The first testing for (Dichromacy characterized by lowered sensitivity to long wavelengths of light resulting in an inability to distinguish red and purplish blue) protanopia and the second for (Dichromacy characterized by a lowered sensitivity to green light resulting in an inability to distinguish green and purplish-red) deuteranopia.
	www.absoluteastronomy.com /encyclopedia/i/is/ishihara_colour_test.htm (230 words)

	Color blindness - Medical Encyclopedia (Site not responding. Last check: 2007-10-16)
		Color blindness is tested using the Ishihara colour test which consists of a series of pictures of colored spots.
		A figure (usually a number) is embedded in the picture as a number of spots in a slighly different color, and can be seen with normal color vision, but not with a particular color defect.
		The full set of tests has a variety of figure/background color combinations, and enable diagnosis of which particular visual defect is present.
	www.nursingstudy.com /encyclopedia/Color_blindness.html (575 words)

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