title: Accommodative changes after photorefractive keratectomy in myopic eyes.
abstract: OBJECTIVE
  To determine the changes of amplitude of accommodation (AA) and facility of accommodation (FA) in myopic patients after photorefractive keratectomy (PRK).
  
  
  METHODS
  Using Technolas 217Z excimer laser, 160 myopic eyes of 80 patients underwent PRK. The patients were categorized into two age groups: <30 and ≥30 years. Changes in AA and FA were observed before PRK and at 2 weeks, 1 month, and 3 months after PRK. The role of preoperative AA, FA, refractive spherical equivalent, age, and sex on postoperative AA and FA was evaluated.
  
  
  RESULTS
  In younger patients, the preoperative AA and FA values 7.77 ± 1.75 D and 7.75 ± 3.97 cpm changed to 8.36 ± 1.26 D and 11.57 ± 4.20 cpm (p < 0.001), respectively, at 3 months after PRK. In older patients, the preoperative AA and FA values 6.66 ± 1.41 D and 5.05 ± 3.26 cpm changed to 6.72 ± 1.26 D (p = 1.000) and 9.58 ± 4.29 cpm (p < 0.001), respectively. Two weeks after surgery, preoperative AA and spherical equivalent had a significant effect on postoperative AA, whereas preoperative AA and age had a significant effect on postoperative AA after 3 months (p < 0.001). Postoperative FA was positively related to preoperative FA and female sex (p < 0.05).
  
  
  CONCLUSIONS
  This study suggests that some of the near-vision problems in younger myopes in early postoperative days after PRK might be due to decrease in AA and FA, which will eventually increase. However, in older patients, despite increase in FA, AA did not change.
authors.affiliation: Ophthalmic Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran. karimianf@yahoo.com
authors.forename: Farid
authors.initials: F
authors.lastname: Karimian
authors.forename: Alireza
authors.initials: A
authors.lastname: Baradaran-Rafii
authors.forename: Abbas
authors.initials: A
authors.lastname: Bagheri
authors.forename: Medi
authors.initials: M
authors.lastname: Eslani
authors.forename: Homa
authors.initials: H
authors.lastname: Bayat
authors.forename: Shila
authors.initials: S
authors.lastname: Aramesh
authors.forename: Mehdi
authors.initials: M
authors.lastname: Yaseri
authors.forename: Anahita
authors.initials: A
authors.lastname: Amin-Shokravi
mesh_terms: D000065:Accommodation, Ocular; D000328:Adult; D000367:Age Factors; D005260:Female; D006801:Humans; D008297:Male; D009216:Myopia / Q000503:physiopathology* / Q000601:surgery*; D018903:Photorefractive Keratectomy; D011184:Postoperative Period; D055815:Young Adult