Abstract
Abstract: :
Purpose: Evaluate the outcome of wavefront–guided ablations for the correction of residual myopia and astigmatism after standard LASIK.Methods: Thirty eyes (27 patients) of individuals that underwent wavefront–guided LASIK retreatment with the Alcon CustomCornea platform were evaluated. Complete ophthalmologic exam, corneal topography and wavefront measurements were performed. Uncorrected visual acuity (UCVA), best corrected visual acuity (BCVA), manifest refraction and wavefront analysis were evaluated preoperatively, 1 week, 3 months and 6 months after surgery. Wavefront measurements were assessed using the LADARWave device. Statistical analysis was performed using paired T–test to assess whether there was a significant change after the surgery, and results were considered significant when P <0.05.Results: One week postoperatively, UCVA was ≥ 20/40 in 92.85% of eyes (≥ 20/20 in 28.57%) and BCVA was ≥ 20/40 in 100% (≥ 20/20 in 67.85%). Wavefront analysis showed a significant decrease in total aberrations (4.28µm preop; 1.55µm 1 week postop), high order aberrations (1.09µm; 0.96µm), defocus, coma, spherical aberration and other terms of HOA at the 1 week follow up. Three months after surgery, UCVA was ≥ 20/40 in 88.88% of eyes (≥20/20 in 33.33%) and BCVA was ≥ 20/40 in 100% (≥ 20/20 in 77.77%). Wavefront analysis showed significant decrease in total aberration, high order aberration, defocus, coma and spherical aberration.Conclusions: Wavefront–guided LASIK retreatment in post–LASIK eyes represents a good option for laser vision correction. All eyes showed reduction in preexisting total aberrations. Some high order aberration components decreased in this initial series. Further follow up will be presented to assess the initial predictability of wavefront–guided LASIK upgrade.
Keywords: refractive surgery: LASIK • refractive surgery: optical quality • refractive surgery: other technologies