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In page Color blindness:
"In the presence of chromatic noise, the color blind are more capable of seeing a luminous signal, as long as the chromatic noise appears metameric to them.[6] This is the effect behind most "reverse" Pseudoisochromatic plates (e.g. "hidden digit" Ishihara plates) that are discernible to the color blind but unreadable to people with typical color vision.[citation needed]
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