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I. Toda, Y. Hori–Komai, M. Ito, T. Yamamoto, K. Tsubota; Quality of Vision After Wavefront–Guided versus Conventional LASIK by NIDEK Excimer Laser . Invest. Ophthalmol. Vis. Sci. 2006;47(13):514.
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© ARVO (1962-2015); The Authors (2016-present)
Wavefront–guided LASIK has been believed to provide better quality of vision compared to the conventional LASIK by correcting higher order aberrations of the eye. To perform precise ablation, data reproducibility in wavefront analyzers and patient alignment using systems such as eye–tracking, torsion error detection, and pupil center adjustment, during surgery are mandatory. However, current wavefront–guided lasers are not always equipped with these systems and may not be adequate to be discussed about the superiority of wavefront ablation. In this study, we compared the clinical results between watvefront–guided (OPDCAT) and conventional (OATZ) LASIK in the NAVEX system (NIDEK), which has above requirements for wavefront–guided LASIK.
One twenty five eyes in 65 patients underwent OPDCAT LASIK for their correction of myopic astigmatism (OP group). Postoperative (3 months) uncorrected (UCVA) and best–corrected (BCVA) visual acuity, refraction (SE), higher order aberrations (HOA), corneal asphericity (Q–value), contrast sensitivity (CS), symptoms, and satisfaction for the outcome were compared with those of patients who underwent OATZ LASIK (OA group, 149 eyes, 87 patients). Age, sex, average target correction, pupil size for the measurement of aberration and the excimer laser used have been matched between the groups.
Total HOA, CS at 4.0, 2.5, 1.6, and 0.7 cycle/degree, and average Q–values were significantly better in OP group. When both groups were divided into subgroups by preoperative refraction (–6D< and >) and total HOA (RMS=0.4µm< and >), total HOA and average Q–values were significantly better in OP–6D<, OP–6D>, OP–0.4µm<, and OP–0.4µm> compared to OA–6D<, OA–6D>, OA–0.4µm<, and OA–0.4µm>, respectively. Significant differences in CS were found only between OP–6D> and OA–6D>, and OP–0.4µm> and OA–0.4µm>. Other values were not significantly different among any groups.
Quality of vision after OPDCAT was objectively better than that after OATZ. Wavefront LASIK may have advantages especially in eyes with high myopia and/or preoperative high degree of HOA.
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