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. Search for 'kblackwhite' to see my other black and white designs. This design (currently set to 646 DPI, with 1.62"x 1.13" charts) can also be scaled or recolored according to your needs - just Spoonmail me or leave a comment!
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