I created this chart from the chart Herman Snellen developed in 1862, which is now in public domain. Search Spoonflower for 'visionchart' to see more colors/sizes/variants, and search for 'synergy0011' for matching designs and solids. This design (currently set to 150 DPI, with 12"x 6" charts) can also be scaled or recolored according to your needs - just ask!
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