RESUMEN
PURPOSE: To assess the compensation of total ocular and corneal wavefront aberrations after conventional myopic LASIK. METHODS: This study comprised 57 eyes of 57 patients. Total and corneal aberrations were measured preoperatively and 3 months postoperatively using the OPD-Scan (NIDEK Co Ltd) aberrometer. Total and corneal aberrations root-mean-square (RMS) was calculated out to the 6th Zernike order for a 6.0-mm pupil diameter. The percentage increase postoperatively was defined by the ratio of RMS pre- and postoperatively for each corneal and total eye group. The compensation between corneal and internal aberrations for a given aberration group was defined as: (corneal aberration group RMS - total eye aberration group RMS)/corneal aberration group RMS. RESULTS: Postoperatively, higher order aberrations increased by a factor of 1.77+/-1.26 (total) and 2.47+/-2.25 (corneal) (P<.05). Coma aberration increased by a factor of 2.43+/-2.61 (total) and 2.56+/-2.66 (corneal). Spherical aberration increased by a factor of 1.46+/-1.83 (total) and 2.64+/-2.24 (corneal). The values of the ratio of compensation did not change significantly before and after LASIK for individual aberrations (P>.05). CONCLUSIONS: Although myopic LASIK induced significant corneal aberrations, the level of partial compensation of corneal aberrations by internal structures remained unchanged. These results suggest that the previously described emmetropization that is effective during development may also be effective with acquired variations in corneal shape.
Asunto(s)
Aberración de Frente de Onda Corneal/etiología , Queratomileusis por Láser In Situ/efectos adversos , Miopía/cirugía , Aberrometría , Adulto , Aberración de Frente de Onda Corneal/fisiopatología , Humanos , Láseres de Excímeros/uso terapéutico , Persona de Mediana Edad , Miopía/fisiopatología , Adulto JovenRESUMEN
The NIDEK Advanced Vision Excimer Laser (NAVEX) platform has been used to treat primary eyes and in a wide variety of therapeutic applications. Use of an extremely robust scanning slit skiascopy aberrometer has enabled the treatment of eyes in the latter category. Primary outcomes using NAVEX have shown a reduced induction of higher order aberrations, a maintenance or gain of contrast sensitivity in most patients, and excellent refractive outcomes. By using an ablation profile that minimizes the amount of induced spherical aberrations, large effective optical zones are seen postoperatively.