The color matches set up b.v the normal observer can be predicted satisfactorily by three functions of wavelength defining the ICI standard observer. It has been found possihle by a transformation of coordinate system to express these three functions in a form slIch that two of the three pairs 3.1S0 represent the color matches of the two recognized types of red-green-blind observer, the p rotanope and the deuteranope, within the rather small uncertainties to which they are known. The remaining pair of function s represents, within the comparatively large uncertainties to which they are known, the color matches of the tritanope, a more rare type of observer who confuses reddish blue with greenish yellow. These three functions, therefore, serve to re13te the color matches made by dichromats to those made by normal trichromats, and so make conveniently accessible the color confusions of average dichromatic observers. The use of these three functions in the solution of problems arising in the design of tests for colorblindness is illustrated by solution of three sllch problems, a nd t heir connection to theories of color vision is discussed.
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