title: [Refraction and anterior chamber depth change after vitrectomy for pseudophakia].
abstract: OBJECTIVE
  To evaluate the association between the vitreous and the refractive error in pseudophakia.
  
  
  METHODS
  Vitrectomy was performed in 67 eyes of 61 patients who underwent cataract surgery. Vitrectomy was needed for epiretinal membrane in 30 eyes, macular edema in 22 eyes, macular hole in 3 eyes, lamelar macular hole in 2 eyes, vitreous opacity in 6 eyes, and vitreous hemorrhage in 4 eyes. Refraction was measured before the operation, and 1 month, 3 months, 6 months, and 12 months after operation. Anterior chamber depth was measured in 10 eyes before the operation, and 1 month, 3 months, and 6 months after operation. We evaluated the refractive error after vitrectomy in 49 eyes that had predicted refraction.
  
  
  RESULTS
  The mean value of refractive change was -0.3 D 1 month postoperatively, and then gradually became positive. The variation of refraction (6-month postoperative refraction minus preoperative refraction) was negatively correlated with preoperative refraction (p = 0.0052, R2 = 0.146). If preoperative refraction was more myopic than -1.5 D, then refraction became positive. If preoperative refraction was not more myopic than -1.5 D, then refraction became negative.
  
  
  CONCLUSIONS
  About 15% of postoperative refractive error may be associated with the vitreous, but further investigation is required.
authors.affiliation: Shinjo Ophthalmologic Institute, Miyazaki, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Kumagai
authors.forename: N
authors.initials: N
authors.lastname: Ogino
authors.forename: S
authors.initials: S
authors.lastname: Demizu
authors.forename: U
authors.initials: U
authors.lastname: Shinjo
authors.forename: M
authors.initials: M
authors.lastname: Shioya
authors.forename: K
authors.initials: K
authors.lastname: Ueda
authors.forename: Y
authors.initials: Y
authors.lastname: Fukuoka
authors.forename: K
authors.initials: K
authors.lastname: Atsumi
authors.forename: H
authors.initials: H
authors.lastname: Hayashi
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000867:Anterior Chamber / Q000502:physiology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D019591:Pseudophakia / Q000503:physiopathology* / Q000601:surgery; D012029:Refraction, Ocular / Q000502:physiology*; D012030:Refractive Errors / Q000209:etiology; D014821:Vitrectomy; D014822:Vitreous Body / Q000502:physiology*