Optical Biometry versus Ultrasonic Biometry in Intraocular Lens Power Calculations in High Axial Myopia

Background : Intraocular lens implantation is now seen as a type of refractive surgery rather than merely being used to improve visual rehabilitation. In this context, accurate preoperative biometric measurement is a crucial requirement. Aim : Comparing the refractive predictability of optical biometry versus applanation ultrasonic biometry in high axial myopic eyes undergoing cataract surgery. Patients and methods : A total of 50 eyes from 50 patients with axial lengths greater than 26.5 mm and just cataracts were analyzed in this study. In this study, patients were randomly assigned to one of the two groups. Twenty-fi ve patients were split evenly between the two groups, with group 1 using optical biometry and group 2 using applanation ultrasound. Results : Group 1 mean age was 53.8 ± 8.9 years as it was 51.8 ± 10.8 years in group 2. There were seven (28%) males and 18 (72%) females in group 1, while there were 11 (44%) males and 14 (56%) females in group 2. There was no statistically signi fi cant variation in axial length between groups ( P ¼ 0.101). There was a statistically signi fi cant increased K1 and K2 among group 1 when compared with group 2 ( P ¼ 0.003 and 0.001, respectively). There was statistically signi fi cant ( P ¼ 0.015) increased anterior chamber depth in group 1 when compared with group 2. Signi fi cant differences in postoperative refraction were seen across the groups ( P ¼ 0.001) (spherical equivalence values). Conclusion : Optical biometry offers signi fi cantly more precise intraocular lens power prediction and refractive outcomes in cataract surgery for high axial myopia than applanation ultrasound biometry.