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Product Code: wh06 (4m) wh07 (3m)As the standard types: E, Landolt Ring, LettersCheck the distance: 4m, 3mCheck the range: from 4.0 to 5.3Sight record: five records, decimals records, scores of records, LogMARVision Light Box Size: 4m 700 * 670 * 18 mm 3m 580 * 520 * 18 mmProduct Code:WH06 (4m): to hang, or stand desktop, with a crystal stand, indicating that rod.WH07 (3m): to hang, or stand desktop, with a crystal stand, indicating that rods.
LogMAR (ETDRS)