Optical Biometry versus Conventional Acoustic Biometry in Post Operative Refraction in Silicon Filled Eyes

Document Type : Original Article

Authors

1 Ophthalmology Department, Faculty of Medicine, Beni-Suef University

2 Ophthalmology Department, Research Institute of Ophthalmology

10.21608/ejmr.2024.306598.1649

Abstract

Background: The use of traditional ultrasound biometry for intraocular lens (IOL) selection before cataract surgery requires a skilled operator, good corneal surface contact, and significant time expenditure. The introduction of non-contact optical biometry has revolutionized preoperative IOL calculation by eliminating these obstacles. One instrument (Intraocular Lens Master [IOLm]; Carl Zeiss Meditec, Jena, Germany), which uses partial coherence interferometry (PCI) technology, was introduced in 2000. Since then, it had been touted for its fast operation without requiring corneal Contact.  Aim of the Work: To compare intraocular lens (IOL) power calculations for cataract surgery in silicon filled eyes by evaluating postoperative refraction using A‑scan biometry versus PCI-based optical biometry. Patients and Methods: This prospective observational study included 30 eyes scheduled for phacoemulsification and silicon oil removal which was conducted at Ophthalmology Department of Beni-Suef University Hospital on January 2023. Patients came seeking biometry using IOL master & A scan, 30 eyes were chosen.  Results: This study was demonstrated that there is statistically non-significant difference between the studied groups regarding baseline Logmar best corrected visual acuity. While postoperatively, there is statistically significant difference between both groups regarding Logmar BCVA (median postoperative Logmar BCVA was 0.3 versus 0.7 with IOL master and A scan groups respectively). This study was cleared that on assessing predicted SE and actual postoperative SE in both groups, there was statistically non-significant difference. Conclusion: IOL master is more accurate and reliable method of IOL power calculation resulting in better visual outcomes as compared to A scan acoustic biometry in silicon filled eyes. Further clinical trials are required on eyes with dense cataract and poor visual acuity biometry using IOL master and A scan acoustic biometry.

Keywords

Main Subjects

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Egyptian Journal of Medical Research
Volume 6, Issue 4
October 2025
Pages 17-26

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