Comparison of Lenstar Optical Biometry Versus Conventional Ultrasonic Biometry in High Myopic Eyes

Y.F.Abdo1, O.M.Kamal1, A.A.S.Tabl1 and M.M.El-Dosoky2"


High myopia, one of the most prevalent eye diseases worldwide. Accurate preoperative intraocular lens [IOL] power calculation is crucial in achieving satisfactory results. We aimed to compare the Lenstar optical biometry versus conventional ultrasonic biometry in high myopic eyes undergoing cataract surgery concerning the accuracy of IOL power calculation before cataract surgery. This study included 20 high myopic eyes of 20 patients. All patients were subjected to a standardized ophthalmologic examination procedure, optical biometry [Lenstar LS900] and standard A-scan applanation ultrasound biometry [Sonomed]. The Pre operative measurements by the optical and ultrasound biometry; were comparable both devices [P>0.05]. Although not significant, the SRK-T formula predicted the best postoperative refraction with the smallest MAE [0.404 ± 0.22 D in the optical biometry] in comparison to [0.439±0.26 D in the ultrasound biometry. In addition; the Optical biometry showed significantly better accuracy than the ultrasound biometry using the Haigis formula. The SRK-T and Haigis formula showed nearly similar efficacy with the optical biometry, although with the ultrasound biometry, the SRK-T formula showed better performance than the Haigis formula. IOL measurements performed with the optical biometery Lenstar LS900, yielded better IOL power prediction and therefore better refractive outcome in cataract surgery than US biometry in high myopic eyes.

Key words

High myopia, Optical biometery, Ultrasound biometry.