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9/4/2013Low Vision Calculations• To figure the distance that a magnifier should be heldfrom the page to get the clearest image:– Convert the diopters to X by dividing by 4– Divide this number into 10Low Vision CalculationsExample- Where should a 20 D magnifier be held forclearest vision?20/4 = 5 x10/5 = 2 inchesNow You Do ItWhere should a 2x magnifier be held to achieve theclearest vision?10/2=5 inchesWhat is the dioptric power of a 2x magnifier?2 x 4 = 8 DNo part of this document can be copied with out permission from EyeTrain4You, Inc. 12
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