AIM: To compare the prediction errors(PE)in cataract surgery with Lenstar and conventional ultrasound.

METHODS: The data of age-related cataract patients were retrospectively analyzed from March, 2013 to June, 2013 in our hospital. Preoperative measurements of ocular biological parameters and calculation of intraocular lens(IOL)degree using SRK/T's formula with ultrasound, keratometry and Lenstar were performed. Cataract extraction combined with IOL implantation in capsule was taken in every patient. Retinoscopy was taken postoperatively after 3 months. Comparison of the two inspection methods for measuring axial length, mean corneal curvature and postoperative refractive PE and absolute value of PE(APE).

RESULTS: Preoperative axial length was 24.68±1.70mm and 24.42±1.65mm with Lenstar and ultrasound, respectively, and there was significant difference(t=-12.688, P<0.001)and significant correlation(r=0.992, P<0.001)between different measurement, and the 95% LoA was in the range between -0.18mm and 0.69mm. Preoperative corneal curvature was 44.22±1.03D and 44.19±1.04D with Lenstar and keratometry, respectively, there was no statistical differences between two methods(t=-1.241, P=0.217), but was the significant correlation(r=0.963, P<0.001), and 95% LoA between 0.52D and 0.58D. PE was 0.05±0.23D and -0.35±0.76D with Lenstar and ultrasound, respectively(t=-5.494, P<0.001). APE were 0.18±0.14D and 0.56±0.62D with Lenstar and conventional ultrasound, respectively(t=6.379, P<0.001).

CONCLUSION: Accurate ocular biological parameters can be achieved with Lenstar, and postoperative PE is more precise with Lenstar compared with conventional ultrasound. Lenstar can be used for precise calculation of IOL degree in cataract operation.