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First Author: O.Reitblat ISRAEL
Co Author(s): A. Abulafia G. Kleinmann A. Levy E. Assia
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To compare the postoperative refraction prediction error in patients with multifocal intraocular lenses (IOLs) based on 2 different biometry devices and various IOL power calculation formulas.
Ein Tal Eye Center, Tel Aviv, Israel
Chart review of patients who had preoperative biometry with both IOLMaster 500 and Lenstar LS 900 and were implanted with a multifocal SN6AD1 (ReSTOR) IOL. Postoperative manifest refraction was performed at least 3 weeks after the operation. Differences between predicted and actual postoperative refractions were calculated after optimization of the IOL constants for the SRK/T, HofferQ, Holladay I, Haigis, and Holladay II formulas for each biometry. IOL calculations using the Olsen formula were done based on the Lenstar alone.
59 eyes of 39 patients were enrolled in this study. The mean postoperative spherical equivalent (SE) was -0.11ḟ0.29D. Pearson correlation coefficients between the IOLMaster and Lenstar for the axial length (AL), anterior chamber depth (ACD) and average keratometry (K) were: 1, 0.918, and 0.996 respectively. The Lenstar measurements were longer (AL), 0.026 mm, P<0.001; deeper (ACD) 0.065 mm, P=0.001; and flatter (K), 0.029D, P=0.09. The mean absolute error (MAE) and the standard deviation of the numerical error (NE-SD) were similar between the 2 devices using all formulas ranging from 0.25 to 0.28D and from 0.31 to 0.34D, respectively. The Olsen formula had a MAE of 0.22Dḟ0.27 using the Lenstar biometry.
The Lenstar biometry measurements correlated well with those of the IOLMaster. There was no clinically significant difference between the MAE using all the combinations of the two biometry devices and the IOL power calculation formulas.