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 't1navy' to see coordinating navy and white designs; search for 'trendy1' or 'trendy2' to see more designs in coordinating colors. This design (currently set to 646 DPI, with 3.25"x 1.13" charts, and 4"x2" on wallpaper) can also be scaled or recolored according to your needs - just ask!