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A New Calibration Method for the Dioptric Power of Intraocular Lenses

Intraocular lenses are widely used in cataract surgery in clinic. Whether the dioptric power of intraocular lenses accurate or not is very important for both patients and doctors. According to the definition of the intraocular lens dioptric power, three measurement methods are analyzed and discussed. A new calibration method to evaluate the quality of intraocular lens instruments is proposed and a new set of test lenses for intraocular lens dioptric power is developed. It consists of eight pieces of lenses with the dioptric power ranging from -10m-1 to 30m-1. The quantity value is determined by calculations from the measured dimensions which can be traceable to the Chinese National Standard. By evaluations, the uncertainty is about (0.02~0.06) m-1 with the coverage factor of 2. Then experiments are carried out on different kinds of instruments with the newly developed test lenses. Results show that the newly developed test lenses for intraocular lens dioptric power can effectively calibrate the measurement error of intraocular lens instruments. The study is helpful in establishing metrological standards for intraocular lens dioptric power in China and guaranteeing the clinical operation quality and vision health of patients.