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Current Developments in Pre-operative Biometry
Haigis W.,
Bayerische Julius-Maximilians-Universität Würzburg, Universitäts-Augenklinik, Labor für Biometrie und Intraokularlinsenberechnung (Würzburg)
Nearly three years ago, the Zeiss IOLMaster became available as the first (and up to now only one) clinically usable biometry device allowing highly precise axial length measurements based on partial coherence interferometry. Calibrated against precision immersion ultrasound, the accuracy of optical biometry is some 10 times higher than contact ultrasound which has hitherto been the standard biometry method.
With the introduction of the new measurement option it became necessary to update and re-compute the lens constants used in IOL power calculation. Within the framework of the User Group for Laser Interference Biometry (ULIB) more than 3000 patient data sets relating to more than 50 different IOL types, which had been sent by surgeons from all over the world, were analyzed up to now. The results are published in the internet in form of optimized constants for all popular IOL power formulas (www.augenklinik.uni-wuerzburg.de/ulib).
Precise measurements and optimized power calculations essentially influence the quality of postoperative refractive outcomes. Even more demanding requirements have to be met when it comes to implanting multifocal or accommodative lenses, torical lenses, or clear lens extractions in high hyperopia or myopia.
Modern biometry procedures and algorithms for IOL power calculation which are presently in clinical use will be compared. An attempt will be made to assess possible future developments.