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First Author: A.Wan Ab Kadir MALAYSIA
Co Author(s): S. Sundralingam M. Peyman V. Subrayan
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To determine the accuracy of Intraocular lens (IOL) calculations performed and compared using Optical Low Coherence Reflectometry (OLCR) (Lenstar LS900) and immersion A-scan biometry.
University Malaya Medical Centre, Kuala Lumpur, Malaysia
A prospective study was done where data from preoperative and 2 months postoperative refraction of recruited patients was analyzed for adult eyes that had underwent phacoemulsification with intraocular lens implantation into the capsular bag. This study had Lenstar and immersion A-scan biometry techniques performed to each eye that is planned for operation, and was compared.
The mean age at surgery of the 200 patients (200 eyes) was 66.86 + 6.95 years, with 87(43.5%) males and 113(56.5%) females. The paired t-test result showed no significant difference between the target value given by Lenstar (p-value = 0.632) or USG (P-value = 0.438) devices and the spherical equivalent value. Independent t-test shows that these magnitudes of difference between the 2 biometric devices are the same (p-value = 0.868). Results also showed that majority of the predicted errors and the absolute predicted errors based on the measurements using Lenstar and Immersion USG biometry fell in the range of + 0.5D from the center of 0.0D
The result of this study shows the immersion ultrasound biometry is reliable and can be recommended for patients undergoing cataract IOL power calculation to provide the required target post-operative outcome.