Ishihara test?
#2
It looks like they are different...
http://white.stanford.edu/newlm/imag...structions.pdf
http://white.stanford.edu/newlm/imag...ructions.I.pdf
http://white.stanford.edu/newlm/imag...structions.pdf
http://white.stanford.edu/newlm/imag...ructions.I.pdf
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