Refractive outcomes comparison between the Lenstar LS 900~R optical biometry and immersion A-scan ultrasound

摘要

To determine the accuracy of intraocular lens (IOL) calculations in eyes undergoing phacoemul-sification cataract surgery with IOL implantation using immersion A-scan ultrasound (US) and Lenstar LS 900~R biometry. In this prospective study, 200 eyes of 200 patients were randomized to undergo either Lenstar LS 900~R or immersion A-scan US biometry to determine the IOL dioptric power prior to phacoemulsification cataract surgery. Post-operative refractive outcomes of these two groups of patients were compared. The result showed no significant difference between the target spherical equivalent (SE) and the post-operative SE value by the Lenstar LS 900~R (p value = 0.632) or immersion A-scan US biometry (p value = 0.438) devices. The magnitude of difference between the two biometric devices were not significantly different (p value = 0.868). There was no significant difference in the predicted post-operative refractive outcome between immersion A-scan US biometry and Lenstar LS 900~R. Based on the results, the immersion A-scan US technique is as accurate as Lenstar LS 900~R in the hands of an experienced operator.