Comparison of Ultrasound Biometry with Optical Biometry for Measurement of Axial Length and Calculation of Intraocular Lens Power in Patients Undergoing Routine Cataract Surgery

Abstract

Objective: To compare the axial length and intraocular lens power calculated by using ultrasound biometry and optical biometry in patients with cataract

Methodology: It was prospective randomized control trial carried out at eye department of Pakistan Institute of Medical Sciences Islamabad from Oct 2021-December 2021, comprising of 50 patients undergoing contract surgery in Eye Department of PIMS using non-probability consecutive sampling. After taking informed written consent from patient’s biometry was performed using optical scan and ultrasound biometry (with appalation probe). Axial length and intraocular power calculated by both methods was recorded.

Results: The mean axial length measurement by ultrasound of the patients’ eyes was 22.72±0.85 mm and by optical biometry was 22.67±0.86 mm. Similarly the mean intraocular lens power calculated by ultrasound was 20.60±1.56D and by optical was 20.51±1.51D. Optical and ultrasound method showed strong positive correlation in measurements of intraocular lens power and axial length of eyes, i.e. r=0.965 & 0.939 respectively.

Conclusion: The findings of this study suggested that optical biometry is good alternate of ultrasound in measurement of axial length and intraocular lens power of patients, as strong correlation exist between both techniques