Sloan Letter

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2.5% ETDRS Sloan Letter Contrast Chart for 13 feet (4 meters)

2.5% ETDRS Sloan Letter Contrast Chart for 13 feet (4 meters)

5% ETDRS Sloan Letter Contrast Chart for 10 feet (3 meters)

5% ETDRS Sloan Letter Contrast Chart for 10 feet (3 meters)

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