Transcription of IOL : POWER CALCULATION & SELECTION
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IOL : POWER CALCULATION & SELECTION
21 Chapter - 3 IOL : POWER CALCULATION & SELECTIONP recise IOL POWER CALCULATION is essential for optimal benefits of implantsurgery. Prior to1975, IOL POWER was calculated on the basis of clinical history, refractive error prior to development of cataract. This led to errors inover 50% of cases. However, a number of formulae are now available to accuratelycalculate the IOL POWER required in a patient. All these formulae are based on anaccurate measurement of the corneal POWER and the axial IN USEThe original formulae were developed prior to 1980. They include thetheoretical formulae and regression formulae. The commonly used formulae are theregression formulae, of which the most popular one is the SRK formula described bySanders D, Retzlaff J. and Kraff M. The formula is based on the following equation:P=A BL-CKwhere P is the implant POWER for emmetropia, L the axial length in millimeters, and Kthe average keratometric reading in diopters.
21 Chapter - 3 IOL : POWER CALCULATION & SELECTION Precise IOL power calculation is essential for optimal benefits of implant surgery. Prior to1975, IOL power was calculated on the basis of clinical history, i.e.
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