Method of calculating the required power of an intraocular lens

Details Method of calculating the required power of an intraocular lens Method of calculating the required power of an intraocular lens

1992-09-02

1994-02-01

Green, Randall L.

Prosthesis (i.e., artificial body members), parts thereof, or ai

Eye prosthesis

Intraocular lens

A61F 216

Patent

active

052828522

ABSTRACT:
A method of calculating the required power of an intraocular lens to be implanted in an eye having the steps of measuring the axial length, preoperative anterior chamber depth and natural lens thickness of the eye, measuring and averaging corneal radii of curvature along a first axis and along a second axis normal to the first axis, calculating a lens locator constant from the axial length and the averaged corneal radii of curvature using a quadratic surface equation, determining a postoperative anterior chamber depth using the measured preoperative anterior chamber depth, the measured natural lens thickness and the calculated constant and calculating the required power of the intraocular lens and the predicted postoperative refraction using the postoperative anterior chamber depth.

REFERENCES:
patent: 4710193 (1987-12-01), Volk
patent: 5092880 (1992-03-01), Ohmi
patent: 5123921 (1992-06-01), Werblin et al.
Article entitled SRK/T betters SRK formula for IOL power prediction in unusually long eyes, Donald R. Sanders, M.D., Ph.D., Ocular Surgery News--vol. 7, No. 8, pp. 1, 24 and 26, Apr. 15, 1989.
Article entitled Development of the SRK/T Intraocular Lens Implant Power Calculation Formula, John A. Retzlaff, M.D., Donald R. Sanders, M.D., Ph.D., and Manus C. Kruff, M.D., J. Cataract Refract. Surg.--Vol. 16, May, 1990.
Article entitled Prediction of Intraocular Lens Position After Cataract Extraction, Thomas Olsen, M.D., J. Cataract Refract. Surg.--Vol. 12, Jul. 1986, pp. 376-379.
Manual of Implant Power Calculation Including SRK II Formula Section Edition, John Retzlaff, M.D., Donald Sanders, M.D., Ph.D. and Manus Kraff, M.D., 1988.

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