Overlapping Ishihara colorblindness test dots in the colors of Synergy's 'Doctor' palette. Search for 'ishiharadots' to see this and related designs in other colors. Search for 'synergy0011' to see more designs in these colors. Want this resized or recolored? Just ask! Shinobu Ishihara (1879 – 1963) was a Japanese ophthalmologist who created the Ishihara color test in 1818 to detect color blindness. His tests are in the public domain; these variations were created by me in the Synergy0011 palette; they haven't been tested for efficacy and shouldn't be used for actual colorblindness testing.
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