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C. Stangogiannis; Lasik: Bitoric Ablation for the Correction of Mixed Astigmatism . Invest. Ophthalmol. Vis. Sci. 2003;44(13):2590.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: To evaluate the safety, efficacy and predictibility of a bitoric approach for the correction of mixed astigmatism by LASIK. To determine the best strategy to estimate the desired correction (subjective and/or cycloplegic refraction). Methods: Prospective, experimental, longitudinal and comparative study that included eyes with mixed astigmatism.Cases were randomly assigned to the following groups: A) Cycloplegic refraction for both, the sphere and cylinder; B) Average of the subjective and cycloplegic refractions for the sphere, and subjective refraction for the cylinder; C) Subjective refraction for both, the sphere and cylinder. All surgeries were performed with a VISX STAR S2 excimer laser (VISX Inc. Sacred Clara, C.A). Patients were excamined at first and third month postoperatively. Results: 37 patients (60 eyes) were included with an average age of 32 years old (range 19-61). Postoperative UCVA, BCVA, refractions (subjective and cycloplegic) showed no significant difference between groups. After surgery, UCVA was 20/30 or better in 75, 50 and 53.3 % in group A, B and, C, respectively. No lines of BCVA were lost. Average postoperative sphere was –1.20 D for group A, -1.52 D for group B and, –0.65 D for group C. Average postoperative cylinder was 1.44 D for group A, 1.43 D for group B and 2.06 D for group C. No postoperative complications were found in any group. Conclusion: Bitoric treatment based on cycloplegic refraction appears to be a better approach for the correction of mixed astigmatism.
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