Comparative analysis of axial length measurement using partial coherence interferometry and clinical ultrasound

Abstract

Purpose: To determine axial length measurement using partial coherence interferometry based IOL Master and comparing it with contact a-scan ultrasonography. Methods: Descriptive cross-sectional study was conducted in Madina Teaching Hospital on 60 patients (Male 36, Female 24) with immature cataract and visual acuity ≤6/24 without any other pathology or previous ocular surgery. Axial length was determined first; using non-contact iol master and then by contact a-scan on same individual. Sample was recruited through non-probability convenient sampling from August 2018 to November 2018. Results: Paired T-test was applied using latest version of SPSS, according to which correlation coefficient was 0.000 and has a significant relation. Pearson correlation ® was 0.733 which stated a positive strength of association. If the selected independent variable (IOL MASTER) increased by 1, the dependent variable (A-Scan) increased by 0.833 according to regression formula. A mean difference of Instruments i.e. IOL MASTER and A-Scan was 2.0333 and 1.9333 respectively, with the Standard Deviation of 0.35415 and the P value of 0.033 according to 5% level of significance. Conclusion: IOL MASTER shows more reliability and accuracy as compared to A-scan and has less chances of error due to non-indentation method.