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M.R. Chalita, M.V. Netto, M. Xu, R.R. Krueger; First Year Experience with Wavefront–guided Ablation for Myopia and Astigmatism Correction . Invest. Ophthalmol. Vis. Sci. 2004;45(13):224.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose:Evaluate wavefront–guided LASIK outcomes for myopia and astigmatism in the first year of its approval. Methods: 184 patients (237 eyes) underwent primary wavefront–guided LASIK treatment using the Alcon CustomCornea platform. UCVA, BCVA, manifest refraction and wavefront analysis were assessed at 1 week, 3 months and 6 months post surgery. Humidity, age and flap thickness were analyzed and correlated to the outcome. Outcomes were classified as: 1.Reduced: value less than preoperative up to half in the opposite direction 2. Induced: greater value in the same direction 3. Induced with Overcorrection: greater than full value in the opposite direction 4. Overcorrection: value more than half in the opposite direction to full value in the opposite direction Results: One week after surgery, UCVA was ≥20/20 in 68.35% of eyes and BCVA was≥20/20 in 91.49%(N= 237). Three months after surgery, UCVA was ≥20/20 in 75.97% and BCVA was ≥20/20 in 96.90%(N= 129). Six months after surgery, UCVA was ≥20/20 in 72.91% and BCVA was ≥20/20 in 100%(N= 48). Total aberrations were reduced in 100% of eyes. HOA were reduced in 31.3% of eyes at 6 months. Defocus, astigmatism, coma and other terms of HOA were each reduced in more than 50% of eyes. Spherical aberration was induced, but in a less amount than conventional treatment. Lower humidity was associated with overcorrection of the spherical component. Thinner flaps were associated with overcorrection of defocus at 1 week and 6 months. Humidity, flap thickness and age were significantly correlated to overcorrection of some of the parameters evaluated in the study. Conclusions: Wavefront–guided LASIK for the correction of myopia and myopic astigmatism showed a good visual outcome. Total aberrations were reduced significantly after the procedure. High order aberrations are still being induced, but to a less amount than when compared to conventional treatments.
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