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SIMPLE METHOD FOR CALCULATING DIOPTRIC POWER

SIMPLE METHOD FOR CALCULATING DIOPTRIC POWER Abstract The methods most in use for calculating the refracting power of a surface or a lens generally involve the use of formulas embodying several fractions. This is necessitated by the fact that the relation between dioptric power and focal length and that between curvature and radius are mathematically reciprocal relations, that is, inverse relations. The longer the focal length, the less is the power ; similarly, the longer the radius, the less the curvature. Memorizing formulas expressed in fractions and carrying out calculations by means of fractions are processes distasteful to most ophthalmologists, especially if they have not had much mathematical training. A method that I have used for many years in teaching this phase of physiologic optics partly eliminates these difficulties. It provides an easily memorized formula and involves a knowledge of only the elements of arithmetic and algebra for calculating dioptric powers. For this purpose I have References 1. This word is the simplest contraction of "meter-curvature," the c at the end reminding one, if that is necessary, that it is a unit of curvature. The word sounds strange at first but becomes perfectly assimilated after one uses it in a few calculations. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Archives of Ophthalmology American Medical Association

SIMPLE METHOD FOR CALCULATING DIOPTRIC POWER

PASCAL, JOSEPH I.
Archives of Ophthalmology , Volume 8 (1) – Jul 1, 1932
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Publisher
American Medical Association
Copyright
Copyright © 1932 American Medical Association. All Rights Reserved.
ISSN
0003-9950
eISSN
1538-3687
DOI
10.1001/archopht.1932.00820140058006
Publisher site
See Article on Publisher Site

Abstract

Abstract The methods most in use for calculating the refracting power of a surface or a lens generally involve the use of formulas embodying several fractions. This is necessitated by the fact that the relation between dioptric power and focal length and that between curvature and radius are mathematically reciprocal relations, that is, inverse relations. The longer the focal length, the less is the power ; similarly, the longer the radius, the less the curvature. Memorizing formulas expressed in fractions and carrying out calculations by means of fractions are processes distasteful to most ophthalmologists, especially if they have not had much mathematical training. A method that I have used for many years in teaching this phase of physiologic optics partly eliminates these difficulties. It provides an easily memorized formula and involves a knowledge of only the elements of arithmetic and algebra for calculating dioptric powers. For this purpose I have References 1. This word is the simplest contraction of "meter-curvature," the c at the end reminding one, if that is necessary, that it is a unit of curvature. The word sounds strange at first but becomes perfectly assimilated after one uses it in a few calculations.

Journal

Archives of Ophthalmology – American Medical Association

Published: Jul 1, 1932

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