title: Hemicentral retinal vein occlusion: natural history of visual outcome.
abstract: OBJECTIVE
  To investigate the natural history of visual outcome in hemicentral retinal vein occlusion (HCRVO).
  
  
  METHODS
  The study comprised 65 consecutive HCRVO patients (67 eyes) seen within 3 months of onset. At first visit, all patients had a detailed ophthalmic and medical history and comprehensive ophthalmic evaluation. Ophthalmic evaluation at initial and follow-up visits included recording visual acuity using the Snellen visual acuity chart, and visual fields with a Goldmann perimeter. Hemicentral retinal vein occlusion was classified into nonischemic (57 eyes) and ischemic (10 eyes) at initial visit.
  
  
  RESULTS
  Nonischemic HCRVO involved superior and inferior half of the retina in 39% and 56%, respectively, and in ischemic HCRVO in 50% and 40%, respectively. In nonischemic HCRVO, initial visual acuity was 20/60 or better in 73.7% and minimal to mild visual field loss in 96% and in ischemic HCRVO in 40% and 55.5%, respectively. After resolution of macular edema, in nonischemic HCRVO eyes, cumulative chance of improvement was 50% with 20/70 or worse initial visual acuity, and deterioration in only 6% with 20/60 or better initial visual acuity, and in 5% with minimal to mild visual initial field loss.
  
  
  CONCLUSIONS
  This study suggests a good prognosis in the natural history of visual outcome in nonischemic HCRVO.
authors: Department of Ophthalmology and Visual Sciences, College of Medicine, University of Iowa Hospitals & Clinics, Iowa City, Iowa 52242-1091, USA. sohan-hayreh@uiowa.edu
authors: Sohan Singh
authors: SS
authors: Hayreh
authors: M Bridget
authors: MB
authors: Zimmerman
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003097:Collateral Circulation / Q000502:physiology; D019773:Epiretinal Membrane / Q000209:etiology; D005260:Female; D006801:Humans; D007511:Ischemia / Q000503:physiopathology; D008269:Macular Edema / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D012170:Retinal Vein Occlusion / Q000145:classification / Q000503:physiopathology*; D014786:Vision Disorders / Q000209:etiology / Q000503:physiopathology; D014792:Visual Acuity / Q000502:physiology*; D014794:Visual Fields / Q000502:physiology*; D055815:Young Adult