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LEA numbers chart proportionally spaced (logMAR); line sizes range from 20/100 to 20/8 (6/30 to 6/2.4) equivalent, 0.20 to 2.50 - this chart can either be wall mounted or used in the 50.028.00 illuminated cabinet - 13 feet/4 meters testing distance - chart size is 9" x 14" (23x35.6 cm)