Comparison of refractive and keratometric astigmatism after microincision cataract surgery.

PURPOSE: To measure the correlation between refractive and keratometric astigmatism after microincision cataract surgery (MICS).

SETTING

Takayanagi Clinic, Kushiro, Hokkaido, Japan.

DESIGN

Retrospective case series.

METHODS

This study evaluated patients having phacoemulsification and intraocular lens implantation through a 2.0 mm temporal clear corneal incision. Refractive astigmatism and keratometric astigmatism were described by Jackson cross-cylinder with-the-rule (J0) and oblique (J45) components and compared using linear regression analysis.

RESULTS

The study comprised 90 eyes of 54 patients. The mean postoperative refractive J0 was -0.29 diopter (D) ± 0.46 (SD), and the mean postoperative refractive J45 was -0.09 ± 0.24 D. The multivariate model for the J0 component was postoperative J0 = 0.75 × keratometric J0 + 0.21 × preoperative J0 - 0.23 (R2 = 0.85, P < .001). The coefficient of determination of the multivariate model was higher than that of the univariate model (R2 = 0.82). The regression equation for the J45 component was postoperative J45 = 0.85 × keratometric J45 - 0.03 (R2 = 0.70, P < .001).

CONCLUSION

Refractive astigmatism and keratometric astigmatism after MICS were strongly correlated.