Article Type

Original Study


Objective The aim of this study was to compare the accuracy of optical biometry and applanation ultrasound measurement of the preoperative intraocular lens (IOL) power calculation formulas (Haigis, SRK/T, and Hoffer Q) of highly myopic eye. Background Implantation of an IOL is the cornerstone in modern day cataract surgery, which is no longer used for just visual rehabilitation but has also become a form of refractive surgery in which the final refractive result can define visual outcome. Accurate biometry necessitates proper axial lens measurements. Patients and methods This study included 60 eyes of 52 patients (nine cases of bilateral and 42 cases of unilateral cataract) [27 female (45%) and 33 male (55%)] with extreme myopia and axial lengths longer than 26.0 mm with cataract as the only ocular pathology. Patients were divided into two groups. Group 1 (the optical biometry group) included 30 patients and group 2 (the A-scan ultrasound group) included 30 patients. Eyes with significant cataract suitable for phacoemulsification and primary in-bag implantation of posterior chamber IOL were included. All patients underwent clear corneal phacoemulsification by the same surgeon and implantation of the one-piece soft hydrophobic acrylic IOL (EYECRYL-600L) IOL (power range −5.0.0 to +15.0 D). Results This study was carried out on 60 eyes of 52 highly myopic patients presenting with cataract. Patients were divided into two groups: group 1, which included 30 eyes that underwent optical biometry using Zeiss 5000 IOL Master, and group 2, which included 30 eyes that underwent A-scan ultrasound biometry using Sonomed PAC SCAN 300 AP. Conclusion Haigis formula with the Zeiss IOL Master using partial coherence interferometry gives significantly better IOL power prediction in highly myopic eyes with cataract compared with US biometry.