title: Visual quality of Q-value-guided LASIK in the treatment of high myopia.
abstract: OBJECTIVE
  To compare visual performance and patient satisfaction following Q-value-guided customized laser-assisted in situ keratomileusis (LASIK) and standard LASIK in the treatment of high myopia.
  
  
  METHODS
  A total of 116 patients with high myopia (-6.00 to -9.50D; astigmatism from -0.00 to -2.00D) were treated using Z-217 excimer laser (Bausch & Lomb). Sixty-six patients (132 eyes) receiving Q-value-guided customized LASIK were assigned into the experimental group, and 50 cases (100 eyes) receiving standard LASIK were used as normal controls.  All subjects were followed up for > 6 months to monitor for night vision problems measure postoperative quality of life.
  
  
  RESULTS
  In the experimental group, night vision acuity decreased in 3 cases (4.5%), and glare was reported in 13 patients (19%) during the 6-month follow up period. In the control group, night vision problems were noted in 9 cases (18%), and glare occurred in 21 patients (42%). These differences between the two groups were statistically significant (P<0.05). According to the postoperative questionnaire,  satisfaction with visual performance and quality of life was reported in 73% of the experimental group, and 52% of the control group (P<0.05).
  
  
  CONCLUSIONS
  Patients with high myopia surgically treated by Q-value-guided LASIK had better night-time visual performance and a higher degree of satisfaction compared with subjects receiving standard LASIK.
authors.affiliation: Zhongshan Ophthalmic Center,Sun Yat-Sen University, Guangzhou, China. zhenghua666@126.com
authors.forename: Hua
authors.initials: H
authors.lastname: Zheng
authors.forename: Liangwen
authors.initials: L
authors.lastname: Song
mesh_terms: D001251:Astigmatism / Q000601:surgery; D019466:Glare; D006801:Humans; D020731:Keratomileusis, Laser In Situ / Q000379:methods* / Q000592:standards; D054018:Lasers, Excimer / Q000627:therapeutic use; D009216:Myopia / Q000601:surgery*; D055254:Night Vision / Q000502:physiology; D017060:Patient Satisfaction; D011788:Quality of Life; D011795:Surveys and Questionnaires; D014792:Visual Acuity