title: Improvement of best spectacle-corrected visual acuity after LASIK in highly myopic eyes with reduced preoperative best spectacle-corrected visual acuity.
abstract: OBJECTIVE
  To evaluate the visual acuity after LASIK in patients with high myopia and in patients with preoperative best spectacle-corrected visual acuity (BSCVA) <0.6.
  
  
  METHODS
  This retrospective study comprised 97 consecutive eyes in 57 patients who underwent LASlK. Preoperative spherical refractive error ranged from -1.75 to -22.00 diopters (D) (mean: -11.77+/-3.61 D) with mean astigmatism of -1.54+/-10.6 (range: 0 to -4.00 D). Pre- and postoperative BSCVA and uncorrected visual acuity (UCVA) were measured and analyzed.
  
  
  RESULTS
  The mean preoperative BSCVA was 0.54+/-0.07 (range: 0.3 to 0.6). The mean postoperative BSCVA was 0.75+/-0.16 (range: 0.5 to 1.2). The mean postoperative UCVA was 0.60+/-0.25 (range: 0.5 to 1.2). A statistically significant improvement was noted in the mean postoperative BSCVA compared with the mean preoperative BSCVA (t=12.78; P<.001) and mean postoperative UCVA compared with preoperative mean BSCVA (t=2.866; P<.01). The safety index was 1.38, which was statistically significant (P<.001). The efficacy index was 1.11, which was statistically significant (P<.01).
  
  
  CONCLUSIONS
  LASIK improved the mean postoperative BSCVA and UCVA compared with preoperative BSCVA in highly myopic eyes with reduced BSCVA.
authors: Shanxi Eye Hospital, Taiyuan, China. he.r@163.com
authors: Rui
authors: R
authors: He
authors: Min
authors: M
authors: Qu
authors: Yi
authors: Y
authors: Fen
authors: Shun
authors: S
authors: Yu
mesh_terms: D000293:Adolescent; D000328:Adult; D003315:Cornea / Q000473:pathology / Q000601:surgery; D019781:Corneal Topography; D005139:Eyeglasses; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D020731:Keratomileusis, Laser In Situ / Q000379:methods*; D008297:Male; D009216:Myopia / Q000503:physiopathology / Q000534:rehabilitation / Q000601:surgery; D011182:Postoperative Care / Q000379:methods*; D011300:Preoperative Care / Q000379:methods*; D012029:Refraction, Ocular; D012189:Retrospective Studies; D012720:Severity of Illness Index; D013997:Time Factors; D016896:Treatment Outcome; D014792:Visual Acuity