Comparison of wavefront aberration changes in the anterior corneal surface after laser-assisted subepithelial keratectomy and laser in situ keratomileusis: Preliminary study

Abstract

In this preliminary study, myopic LASEK and LASIK changed total and higher-order corneal aberrations. In both procedures, changes in spherical-like aberrations were dependent on the achieved correction. However, in individual eyes, spherical-like aberrations increased more after LASEK than after LASIK for low-moderate achieved correction, suggesting that these procedures may induce the same optical changes in the anterior corneal surface in different ways.

Corneal aberrations and objective visual quality after hyperopic laser in situ keratomileusis using the Esiris excimer laser

“…24,[29][30][31][32][33] An increase in spherical-like and coma-like aberrations has been reported. [24][25][26][27][28][29][30][31]33 With hyperopic LASIK, an increase in HOAs has been also detected, 19,21,23,24 although the pattern for spherical-like aberrations was different from that with myopic ablation. 19,21,23,24 In this study, we evaluated the corneal and ocular aberrations induced by hyperopic LASIK performed using a flying-spot laser of the latest technology and a small spot (0.8 mm).…”

“…A significant increase in the coma-like aberrations with the surgery was observed, as in previous reports. 19,[23][24][25][26][27][28][29][30][32][33][34] Normally, this kind of aberration is associated with decentration of the ablation in keratorefractive procedures, even with subclinical levels. 31,35,36 The peripheral ablation of hyperopic procedures is more sensitive to subtle levels of decentration and could be a factor in the aberrations seen in this type of surgery.…”

Visual acuity and higher-order aberrations with wavefront-guided and wavefront-optimized laser in situ keratomileusis

“…Conventional LASIK induces higher-order aberrations (HOAs). [1][2][3][4][5][6][7] Wavefront-guided treatments are intended to reduce preoperative HOAs, and wavefront-optimized treatments are intended to minimize the induction of postoperative HOAs; both modalities appear to minimize postoperative HOA changes significantly compared with conventional LASIK treatments. [8][9][10][11] There are some reported differences in the outcomes of wavefront-guided and wavefront-optimized platforms; however, few studies have directly compared the outcomes of these different technologies.…”

Corneal wavefront–guided enhancement for high levels of corneal coma aberration after laser in situ keratomileusis

“…However, the procedure can induce significant amounts of higherorder aberrations (HOAs), especially coma and spherical aberration. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] These induced aberrations have been correlated with bothersome visual symptoms and night-vision disturbances after refractive surgery. 4,15,16 Therefore, the induction of aberrations with the corneal induced by refractive surgery reduces the quality of vision and patient satisfaction postoperatively.…”