An algorithm computes astigmatic refractive errors from ocular parameters, suggesting easier calculations for eye care professionals.
Calculation of total refractive astigmatism by analyzing refractive parameters of the individual components can be very tedious, especially when the principal meridians among all the components are not orthogonal. A straightforward programming algorithm for accomplishing these calculations is presented. The algorithm is applicable to any programmable device which performs trigonometric functions.
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Paul A. Erickson (1981) studied this question.
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