The other equivalents featured on these charts are letter size, 20 foot, 6 meter, decimal, and LogMAR. Available in three different versions of mixed/scrambled order when repetitive testing is indicated. These charts fit in the ESV3000 Standardized ETDRS illuminated cabinet and the ESC2000 Illuminated ETDRS Clinical Trial Cabinet. LEA NUMBERS® Standard Chart is also available in a thinner translucent chart that can be easily rolled up. Test distance: 13 feet/4 meters.