title: Long-term visual outcomes of vitrectomy for cystoid macular edema due to nonischemic central retinal vein occlusion.
abstract: OBJECTIVE
  To report the long-term surgical outcome of vitrectomy for cystoid macular edema due to nonischemic central retinal vein occlusion (CRVO).
  
  
  METHODS
  A retrospective chart review of 25 consecutive eyes (25 patients) with cystoid macular edema due to nonischemic CRVO treated with vitrectomy was performed. All patients underwent a pars plana vitrectomy with the creation of a posterior vitreous detachment if still attached. Simultaneous phacoemulsification with intraocular lens implantation was also performed in phakic eyes. The main outcome measures were best-corrected visual acuity (BCVA) and changes in macular edema shown by contact-lens biomicroscopy. The mean follow-up time was 49 months (range, 16-108).
  
  
  RESULTS
  The median BCVA before surgery was 0.31 and the median BCVA at last follow-up was 0.67. The BCVA at the last follow-up improved at least two Snellen lines in 17 (68%), remained unchanged in 4 (16%), and worsened in 4 (16%). The BCVA was 20/40 or better in 3 eyes (12%) preoperatively and in 18 eyes (72%) at the last follow-up. During the follow-up, four patients progressed to ischemic CRVO; one of them had neovascular glaucoma requiring surgical intervention.
  
  
  CONCLUSIONS
  The data indicate that vitrectomy appears to be a possibly effective treatment in some eyes with cystoid macular edema associated with nonischemic CRVO.
authors.affiliation: Department of Ophthalmology, Kami-iida First General Hospital, Nagoya, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Furukawa
authors.forename: K
authors.initials: K
authors.lastname: Kumagai
authors.forename: N
authors.initials: N
authors.lastname: Ogino
authors.forename: A
authors.initials: A
authors.lastname: Uemura
authors.forename: E
authors.initials: E
authors.lastname: Larson
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D019654:Lens Implantation, Intraocular; D008269:Macular Edema / Q000209:etiology / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D018918:Phacoemulsification; D012170:Retinal Vein Occlusion / Q000150:complications*; D012189:Retrospective Studies; D016896:Treatment Outcome; D014792:Visual Acuity / Q000502:physiology*; D014821:Vitrectomy / Q000379:methods*