You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
9/4/2013Now You Do It• Exercise:Rx: OD: +11.00 SphOS: +12.00 SphThe optical centers are both displaced 4 mmtemporally (out)What is the amount and direction of induced prism?AnswerFormula is: Prism = Power x Decentration in cmOD: +11.00 x .4 = 4.4 4 ½ prism diopters (rounded)OS: +12.00 x .4 = 4.8 5 prism diopters (rounded)Prism is base out because with a plus lens, thedecentration shifts with the lens.Low Vision Calculations• To find the dioptric power of a magnifier, multiplythe X power by 4.– Example:– A magnifier that is 10x would be 40 diopters (10 x4 = 40)No part of this document can be copied with out permission from EyeTrain4You, Inc. 11
Change language