Two smaller groups 5M to 2M for repetitive testing (20/25, 6/7.5 to 20/10, 6/3 equiv.).
Can be wall-mounted.
Sloan chart uses traditional optotypes that follow a 5×5 grid idea. Sloan eye test uses logarithmic format and has equivalents on each side. They include LogMar, Decimal, 10 feet, and Meters for easy acuity recording.
Chart comes in three scrambled versions (CAT. NO. 2102A, 2102B and 2102C) or an identical REVERSED optotype chart (CAT. NO. 2102R) used for mirror testing in smaller offices.