Comparison of optimized surface ablation and combined customized plus optimized surface ablation in myopic eyes

Background Proscan treats errors of refraction without affecting asphericity, while customized treatment treats correction with high-order aberration (HOA). Recently, Zyoptix HD has been used in the treatment of preoperative HOA and lower-order aberrations without inducing spherical aberrations. Aim To compare the visual outcomes and HOAs after optimized surface ablation versus Zyoptix HD surface ablation for myopia. Patients and methods A prospective comparative clinically controlled study was conducted on patients who have myopia, 40 eyes of 20 patients divided into two groups. Group I: 20 eyes underwent optimized surface ablation. Group II: 20 eyes underwent customized plus optimized surface ablation. The selection of treatment was according to root mean square and spherical aberration corneal topography. All participants were examined by a slit lamp just after the operation, on the first, third, seventh postoperative day, weekly for 1 month, then biweekly for 3 months. The patients had full follow-up by best corrected visual acuity, slit lamp, Orbscan IIZ, and wavefront aberrometry using Zywave after 3 months of procedure. Results The comparison between preoperative uncorrected visual acuity and 3 months postoperative uncorrected visual acuity improved significantly in both groups but better in group II. The comparison between preoperative and 3 months postoperative root mean square in group I increased significantly, and in group II improved significantly, which is better in group II. Conclusion Zyoptix HD is superior to optimized surface ablation in the correction of low-order and high-order eye aberrations, correcting myopia and visual acuity.