Laser in situ keratomileusis correction of mixed XXXX by bitoric ablation.

@entity1 @entity6110 @entity940
PURPOSE: To evaluate the effect of bitoric ablation (cross cylinder) in 1 eye and ordinary monotoric treatment in the contralateral eye of @entity1 with mixed @entity940 . SETTING: Instituto Oftalmol  gico de Alicante and University of Miguel Hern  ndez, Alicante, Spain. METHODS: A comparative consecutive study was initiated in 30 eyes of 15 @entity1 with mixed @entity940 . In each @entity1 , 1 eye was treated with bitoric ablation (Group 1) and the other eye was treated with monotoric ablation (Group 2). The decision to treat with bitoric or monotoric ablation was randomized. All @entity1 were operated on by the same surgeon (J.L.A.) and examined by the same investigators (M.J.A., M.A.H.). All completed a 6-month follow-up. Visual acuity was estimated by transforming the Snellen chart readings into logMAR equivalents. In Group 1, theoretical ablation was also performed on glass slides by making 3 ablation profiles (positive, negative, and bitoric). RESULTS: There was a statistically significant improvement in the mean uncorrected visual acuity (UCVA), the mean @entity6110 ( @entity6110 ), and the mean refractive cylinder in Group 1 (P<.0001, P =.04, P<.0001, respectively) and in the mean refractive cylinder in Group 2 (P =.01). Better results were obtained in the mean incremental change in UCVA, best corrected visual acuity, @entity6110 , and refractive cylinder in Group 1. CONCLUSIONS: Treatments to correct mixed @entity940 vary in ablation profiles and depth. Bitoric ablation appears to be safer, more effective, and more tissue sparing than the standard treatment.
