الفهرس 
IOL master 700 versus Lenstar 900 Biometry in Intraocular Lens Power Calculations in Different Axial Lengths
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Abstract
Purpose: To evaluate the agreement between IOL master 700 Swept Source Optical Coherence Tomography (SS-OCT) based biometry and Lenstar 900 Optical Low Coherence Reflectometry (OLCR) based biometry, regarding Axial Lenghth (AXL), Anterior chamber depth (ACD), Lens thickness (LT), Keratometry (K1, K2), Intraocular Lens (IOL) Power and predicted postoperative refraction.
Methods: A prospective comparative observational study that includes 60 eyes of 60 patients scheduled for phacoemulsification. For each patient optical biometry has been performed using both Lenstar 900 and the IOL master 700.
Results: Statistical analysis included 56 patients (4 patients were DROP out). There was no statisticaly significant difference between both devices regarding AXL, K1, K2, IOL Power, Predicted Post operative Refraction measurements (p =0.682, 0.212, 0.213, 0.085, 0.184 respectively). statisticaly significant interdevice agreement with a statisticaly strong positive correlation between both devices regarding AXL, K1, K2, IOL Power, Predicted Post operative Refraction measurements (r=0.993, 0.862, 0.871, 0.991,0.309 respectively , p≤0.001). There was statistical significant difference between both devices regarding LT, ACD measurements (p=0.000, 0.041 respectively). statisticaly interdevice agreement with a statisticaly significant strong positive correlation between both devices regarding LT, ACD measurements (r=0.942, 0.953 respectively, p≤0.001). Regarding the Absolute error there was no statistical significant difference (p =0.557) and statisticaly agreement with a statistical significant positive correlation between both measurements (r=0.556, p≤0.001). Subgroup analysis was done between both machines for the LT measurements: There was a statistical significant difference in the emmetropic, myopic, hypermetropic groups (p =0.003, 0.034, 0.041 respectively) and for the ACD measurements in the hypermetropic group (p=0.031) .Subgroup analysis was done between both machines for the ACD measurements: There was no statistically significant difference in the emmetropic, myopic groups (p=0.058, 0.449 respectively) and for predicted post operative refraction measurements in the emmetropic, myopic, hypermetropic groups (p=0.094, 0.243, 0.495 respectively). Subgroup analysis was done for Absolute error measurements as regard each biometry separately, the IOL master 700 showed no statistically significant difference in the emmetropic, hypermetropic groups (p=0.111, 0.747 respectively) whereas there was a statistical significant difference in the myopic group (p=0.023), the lenstar 900 for absolute error measurements showed a statistically significant difference in the emmetropic, myopic groups (p=0.039, 0.023 respectively) whereas there was no statistically significant difference in the hypermetropic group (p=0.606).
Conclusions: IOLmaster 700 and Lenstar LS 900 have agreement and positive correlation in most ocular biometric measurements, although some statistically significant differences were observed in ACD and LT. These differences could be neglected since there was no statistically significant difference in the calculated IOL power. However the IOL master 700 showed more accurate post operative results as regard the calculated IOL power.