ELEMENTS OF THE DIOPTRIC POWER MATRIX AND THE CONCEPT OF TORSIONAL POWER - A REINTERPRETATION

被引：20

作者：

HARRIS, WF

机构：

[1] Department of Optometry, Rand Afrikaans University, Johannesburg

来源：

OPTOMETRY AND VISION SCIENCE | 1990年 / 67卷 / 01期

关键词：

Dioptric power matrix; Meridional power; Notional power; Oblique power; Torsional power;

D O I：

10.1097/00006324-199001000-00008

中图分类号：

R77 [眼科学];

学科分类号：

100212 ;

摘要：

The elements of the dioptric power matrix have previously been interpreted in terms of power along particular meridians with the off-diagonal elements interpreted as a new form of dioptric power called torsional power. This paper shows that such new concepts are not necessary. Decomposition of the matrix provides an interpretation in terms that are quite familiar. The elements represent three component powers: the diagonal elements are two cylinders and the off-diagonal elements a crossed-cylinder with axes at 45° and 135°. The component crossed-cylinder obviates the need for the concept of torsional power. The concept of meridional power is avoided. © 1990 American Academy of Optometry.

引用

页码：36 / 37

页数：2

共 9 条

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