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and efficacy. Results ? Postoperative astigmatism was statistically lower (p 0,005) at all follow up time 00 . 20 . 40 . 60 . 811 . 21 . 41 . 61 . 821 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18Ey e n u m b e rA s t i g m a t i c e r r o r i n d i o p t e r s o v e r 4 y e a r sP r e o p e r a t i v ea st i g m a t i smA st i g m a t i sm a t1 y e a rA st i g m a t i sm a t4 y e a r sResults ? SEq achieved corrections were statistically correlated (p 0,0001) to the attempted values ? 00 . 511 . 522 . 533 . 5D i op t e r s1 3 5 7 9 11 13 15 17e y e nu m be rA c h i e v e d s p h e r i c a l e q u i v a l e n tP r e o p s p h e r i c a le q u i v a l e n t4 y e a r s p o s t o p s p h e r i c a