Method of analysing astigmatism and apparatus for performing cor

Details Method of analysing astigmatism and apparatus for performing cor Method of analysing astigmatism and apparatus for performing cor

1996-03-19

1998-05-12

Peffley, Michael

Surgery

Instruments

Light application

606 5, 128898, A61N 506

Patent

active

057498679

ABSTRACT:
A method of analyzing astigmatism is disclosed which enables surgeons to ascertain what surgery may be required subsequent to initial surgery to achieve the preoperative aim of the initial surgery. The method includes determining a preoperative astigmatism, defining an aimed astigmatism and determining an achieved astigmatism following initial surgery. The astigmatism values are initially determined in a zero to 180 degree range and are doubled to convert them to a 360 degree range. An aimed induced astigmatism vector, a surgically induced astigmatism vector and a difference vector are calculated. Magnitudes and angles of the vectors can be calculated to provide astigmatism magnitude values and angle values for modifying parameters of future surgery for improved performance of future surgery and for statistical analysis. The method also provides a rationale for determining a treatment parameter when spectacle and corneal astigmatism do not coincide.

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Cravy, T.V. "Calculation of the Charge . . . " Opthalmic Surgery, vol. 10, No. 1, Jan. 1997 pp. 38-49.
Jaffe, N.S. et al. "The Pathophysiology of Corneal Astigmatism . . . " Trans Am Acad. Ophtaalmol Otolaryngol, vol. 79, 1975 pp. 615-630.

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