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    The LEA Numbers Chart for Vision Rehabilitation is designed for testing children and adults with visual impairment at a distance of one meter. The largest numbers are 50M in size, corresponding to 1m/50M = to 1/50 or decimal visual acuity 0.02, equivalent values 20/1000, 6/300. The smallest numbers are 1M in size corresponding to 1m/1M = to 1/1 or decimal visual acuity 1.00, equivalent values 20/20, 6/6. Designed courtesy of August Colenbrander, MD. Chart measures 16" x 21.5"(40.7 cm x 54.6 cm). Folds to 16" x 10.75" (40.7 cm x 27.3 cm). 40 inches/1 meter testing distance.