title: Near Point of Accommodation and Convergence after Photorefractive Keratectomy (PRK) for Myopia.
abstract: OBJECTIVE
  Near point of convergence (NPC) and near point of accommodation (NPA) were evaluated before and after photorefractive keratectomy (PRK) in normal myopic eyes.
  
  
  METHODS
  In this prospective cross sectional study, NPC and NPA were measured in 120 myopic eyes (60 patients) before and 3 months after PRK. Excluding criteria were manifest tropia, previous eye surgery, amblyopia, and any other ocular pathology. All subjects were younger than35 years old.
  
  
  RESULTS
  Fifty-one females (85%) and nine males (15%) participated in the study. The average age of the participants was 25.75 years. Before the operation, the average NPC and NPA were 4.35 cm and 6.9 cm (14.5 D), respectively. NPC and NPA increased significantly 5.63 (p = 0.025) and (p 0.05) to 7.983 cm (12.5 D) (p 0.001), respectively, after 3 months.
  
  
  CONCLUSIONS
  NPC and NPA may increase significantly after PRK. Convergence and accommodation problems may affect near visual performance. Therefore, for any PRK candidate, accommodation and convergence should be evaluated.
authors.forename: Hassancourtney
authors.initials: H
authors.lastname: Hashemi
authors.forename: Behnaz
authors.initials: B
authors.lastname: Samet
authors.forename: Ali
authors.initials: A
authors.lastname: Mirzajani
authors.forename: Mehdi
authors.initials: M
authors.lastname: Khabazkhoob
authors.forename: Bijan
authors.initials: B
authors.lastname: Rezvan
authors.forename: Ebrahim
authors.initials: E
authors.lastname: Jafarzadehpur
mesh_terms: D003315:Cornea / Q000601:surgery; D003430:Cross-Sectional Studies; D006801:Humans; D054018:Lasers, Excimer; D009216:Myopia / Q000601:surgery; D018903:Photorefractive Keratectomy; D011446:Prospective Studies; D012029:Refraction, Ocular; D014792:Visual Acuity