The Accuracy of Optical Biometric Measurements in Predicting the Refractive Outcome After Phacoemulsification in Ibn AL-Haitham Teaching Eye Hospital, Baghdad

Zeinab Ali Al-Mudhafar; Ammar Baqir Al Hashemy

doi:10.54133/ajms.v9i2.2496

المؤلفون

Zeinab Ali Al-Mudhafar Ophthalmology Section, Department of Surgery, College of Medicine, University of Baghdad, Baghdad, Iraq https://orcid.org/0009-0001-4629-1830
Ammar Baqir Al Hashemy Ophthalmology Department, Al-Imamain Al-Khademain Teaching Hospital, Baghdad, Iraq https://orcid.org/0009-0007-1260-6762

DOI:

https://doi.org/10.54133/ajms.v9i2.2496

الكلمات المفتاحية:

Biometry، Cataract، Intraocular lense، Phacoemulsification

الملخص

Background: Cataract surgery is one of the commonest surgeries done globally. Accurate biometry is a prerequisite for optimal outcome. Optical biometry devices are considered the gold standard for measurements. Objective: To compare the concordance and accuracy in ocular biometric measurements and IOL power calculations using LenStar 900 and IOLMaster 500 with 5 preinstalled formulas. Methods: In a longitudinal prospective comparative study of candidates undergoing phacoemulsification, biometry was done by IOLMaster 500 and LenStar 900, and 5 formulas were used to predict the postoperative spherical equivalent. A comparison was done between these equations and the actual postoperative spherical equivalent obtained 4 weeks post-surgery to assess the performance of each equation. Results: Ninety-four patients were eligible for comparison. Linear regression showed excellent correlation for axial length and keratometry (R^²>0.9); the correlation was good for anterior chamber depth (R^²=0.885). Significant differences were seen between axial length, steepest keratometry, mean keratometry, and anterior chamber depth. In most patients, the actual postoperative refraction was more myopic than predicted; SRK/T by IOLMaster gave a more myopic shift than LenStar, and Holladay 1 by IOLMaster gave a more hyperopic shift than LenStar. Barrett predicted more myopic shift than the rest. Conclusions: Statistically significant differences were found between the two devices in some parameters, yet they can be negligible in practice and can be used interchangeably. All the formulas resulted in more myopic shift than expected in most patients with comparable performance.

التنزيلات

بيانات التنزيل غير متوفرة بعد.

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