OPTICAL MATH MADE EASY!

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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
9/4/2013Test Height CalculationsThe 20/400 E should be88 mm in height ifpatient is 20 feetaway.What if patient is 17 feetaway?20 ft 17 ft88 mm = X mm88 times 17 equals 1496X equals 74.8Now You Do ItWhat if thepatient is 15feet away?20 ft 15 ft88 mm X mm88 times 15 equals 1320X equals 66 mmNo part of this document can be copied with out permission from EyeTrain4You, Inc. 13
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