How does one make an Ishihara color test chart that finds protanopes and distinguishes them from deuteranopes?

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How does one make an Ishihara color test chart that finds protanopes and distinguishes them from deuteranopes?



Answer:

(1) Find two colors along a color confusion line for the test in question (i.e protanope vs. deuteranope)
(2) using spots, make a number with one color and the background of the other
(3) randomize the intensities and sizes of the stops
(4) Option: make a number of lower contrast that will be visible to subject of the test

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