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TORIC LENS VOLUME
Author(s) -
Churms P. W.
Publication year - 1982
Publication title -
ophthalmic and physiological optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.147
H-Index - 66
eISSN - 1475-1313
pISSN - 0275-5408
DOI - 10.1111/j.1475-1313.1982.tb00170.x
Subject(s) - lens (geology) , volume (thermodynamics) , cylinder , calculator , optics , computer science , mathematics , geometry , physics , quantum mechanics , operating system
Theory is derived for the calculation of the volume of type‐ and barrel‐form torie lenses. The integral produced is evaluated using an approximate method of integration. Differences between the two volumes are considered insignificant in the corner of spectacle lens manufacture. Methods of approximating the Volumes of boil) type‐ and barrel‐form torie lenses are examined. An approximate method, relying upon standard formulae pertaining to the volume of the sphere and cylinder, is sufficiently refined for most practical purposes and obviates the use of a sophisticated calculator nr computer.