Abstract: Objective To compare the differences of corneal keratometry and corneal astigmatism measured by Len⁃ star LS900 and KR-1 auto-refractor of age-related cataract. Methods Seventy-six patients with cataract (76 eyes) were in⁃ cluded in this study. Flat keratometry (K1), steep keratometry (K2), mean keratometry (Km) and astigmatism were measured before operation by Lenstar LS900 and KR-1 auto-refractor. The parameters of astigmatism were transformed into J0 and J45 by Fourier vector transform, and which was compared. Results Values of K1, K2, Km, J0 and J45 were (43.960±1.440) D, (44.901±1.319)D, (44.430±1.336)D, 0.043±0.402 and 0.017±0.425 measured by Lenstar LS900, respectively, and which measured by KR-1 auto-refractor were (44.007±1.400)D, (44.859±1.338)D, (44.433±1.330)D, -0.058±0.322 and 0.031± 0.419, respectively. There was no statistical difference between these values measured by two instruments (P＞0.05). The Bland-Altman plots showed that two devices had coincident results for corneal parameters. Conclusion Lenstar LS900 and KR-1 auto-refractor can be applied in the measurement of corneal astigmatism of age-related cataract before surgery.

Key words: cornea, astigmatism, refractometry, vector, auto-refractor, Lenstar, KR-1