Recovery of Uncorrected Visual Acuity After Laser In Situ Keratomileusis or Photorefractive Keratectomy for Low Myopia
作者:
Mark Walker,
Steven Wilson,
期刊:
Cornea
(OVID Available online 2001)
卷期:
Volume 20,
issue 2
页码: 153-155
ISSN:0277-3740
年代: 2001
出版商: OVID
关键词: Excimer laser;LASIK;PRK;Refractive surgery;Visual performance
数据来源: OVID
摘要:
Purpose.To compare uncorrected visual acuity and refractive error in patients undergoing photorefractive keratectomy (PRK) and laser in situ keratomileusis (LASIK) between 1 week and 6 months after surgery.Methods.All eyes underwent PRK or LASIK with the VisX StarS2 excimer laser. We retrospectively analyzed data from 77 random eyes of 77 patients in the PRK group and 76 eyes of 76 patients in the LASIK group. All eyes had a low myopic refractive error (spherical equivalent range, −0.88 diopters (D) to −5.13 D; mean PRK, −2.8 ± 0.20 D; LASIK, −2.5 ± 0.22 D). Uncorrected visual acuity and manifest refractive error were evaluated 1 week, 1 month, and 6 months after surgery.Results.Each eye undergoing PRK was paired with an eye undergoing LASIK for a similar level of spherical equivalent. Mean uncorrected visual acuity after 1 week was 0.85 ± 0.06 (20/25, logMAR 0.12 ± 0.04) for the PRK group and 1.01 ± 0.06 (20/20, logMAR 0.01 ± 0.03) for the LASIK group (p< 0.001). Mean spherical equivalent after 1 week was 0.23 ± 0.12 D for the PRK group and −0.02 ± 0.07 D for the LASIK group (p= 0.02). Mean uncorrected visual acuity after 1 month was 1.03 ± 0.05 (20/20, logMAR 0.02 ± 0.03) for the PRK group and 1.05 ± 0.05 (20/20, −0.02 ± 0.03) for the LASIK group (p= 0.16). Mean spherical equivalent after 1 month was 0.19 ± 0.10 D for the PRK group and −0.02 ± 0.09 D for the LASIK group. This difference was statistically significant (p= 0.02), but was unlikely to be clinically significant. Mean uncorrected visual acuity after 6 months was 1.05 ± 0.06 (20/20, logMAR −0.01 ± 0.03) for the PRK group and 1.06 ± 0.05 (20/20, logMAR −0.14 ± 0.03) for the LASIK group (p= 0.41). Mean spherical equivalent after 6 months was 0.02 ± 0.08 D for the PRK group and 0.00 ± 0.08 D for the LASIK group (p= 0.35).Conclusion.Uncorrected visual acuity 1 week after surgery is significantly better in eyes undergoing LASIK than in eyes undergoing PRK. Both procedures provide functional vision by 1 week after surgery. The difference does not relate to refractive error, which was similar between the two groups, but to differences in healing of the epithelium. By 1 month after surgery, there is no difference in mean uncorrected visual acuity between eyes that undergo PRK or LASIK for low myopia.
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