Four-year follow-up of corneal aberrations and visual functionsof myopic patients after laser in situ keratomileusis

Abstract

Objective:To report on 4-year follow-up of corneal higher-order aberrations and daily visual functions of myopic patients after laser in situ keratomileusis (LASIK).Methods:One hundred thirty four eyes of 67 patients who underwent LASIK guided by aspherical ablation were included in this study. The vision, corneal spherical aberration (SphA) and Coma were recorded before LASIK and at 6 month and 4 year after LASIK. The evaluation of the questionnaire about daily visual functions was performed by the same physician after LASIK.Results:No eye decreased the BCVA during 4 year follow-up. The effect index and safety index were 1.08±0.16, 1.11±0.17 and 1.12±0.16, 1.13±0.14 respectively at 6 month and 4 year post-LASIK. After LASIK the corneal SphA and Coma were significantly increased, however the difference between 6 month and 4 year post-LASIK was no statistical significance. Most patients (94.3%-92.4%) felt satisfaction or high satisfaction about the ability to perform each daily visual function after LASIK. Meanwhile there was still about 7.4%-9.2% patients who complained that they could not drive at night. Further analysis showed that the score of driving at night was negative correlation with corneal SphA (r=-0.645, p=0.040; r=-0.688, p=0.040 at 6 month and 4 year post-LASIK respectively).Conclusions:Our four-year follow-up outcomes indicated that the myopic patients after LASIK had the long-term stable corneal aberration and satisfaction of daily visual functions.

Changes of corneal high-order aberrations after femtosecond laser-assisted in situ keratomileusis

“…This technique has been reported to induce high-order aberrations. [24] Furthermore, the pupil offset from the visual axis can also induce high-order aberrations. Additional causes of high-order aberrations reported by other authors include wound response of the cornea after FS-LASIK, change in corneal shape after ablation, and individual differences in corneal biomechanical response.…”

Drei Jahre Nachbeobachtung nach refraktiver Small Incision Lenticule Extraction (SMILE) mit einem 500-kHz-Femtosekundenlaser im „Fast Mode“

“…In der 4-Jahres-Studie nach LASIK von Liu et al [16] (n = 134; SÄ − 5,10 dpt) verlor kein Auge 1 Zeile oder mehr. Dieses Ergebnis liegt deutlich über dem der vorliegenden Studie mit 20 % 1-Zeilen-Verlust.…”

“…Darüber hinaus scheinen die Lasersettings eine extrem wichtige Rolle für die Visusergebnisse nicht nur kurzfristig, sondern auch mittelfristig zu spielen. Die außerordentliche Stabilität des ReLEx-SMILE-Verfahrens im Vergleich zu LASIK [16] ließ sich auch in dieser Studie bestätigen.…”

High-order aberration changes after femtosecond LASIK surgery in patients with high myopia

“…Some reports have suggested that coma and spherical aberrations play a major role in affecting vision quality and showed a correlation between starburst and spherical aberrations, glare and spherical aberrations, with as well as a correlation between diplopia and horizontal coma (17,18). Coma can be caused by the corneal flap, an unsmooth corneal stromal bed, as well as the corneal wound-healing response (19)(20)(21). Previous studies have suggested that postoperative spherical aberrations may be caused by the "cosine effect", and that ablation changes the corneal shape from long oval to flat oval after surgery (22).…”