title: Predictive clinical features and outcomes of vitrectomy for proliferative diabetic retinopathy.
abstract: OBJECTIVE
  To study the preoperative characteristics, complications and outcomes of vitrectomy for proliferative diabetic retinopathy and to identify any factors that may predict visual outcome.
  
  
  METHODS
  Prospective study of 174 consecutive vitrectomies in 148 patients, with a minimum follow-up of 4 months.
  
  
  RESULTS
  41 (27.7%) patients had a vision of <6/60 in their better eye at presentation. Posterior retinal breaks occurred in 47 (27.0%) eyes. Postoperative complications included vitreous cavity haemorrhage in 37 (22.0%) eyes, retinal detachment in five eyes (3.0%), and rubeotic glaucoma in five eyes (3.0%). 124 (74.7%) eyes improved by at least 0.3 LogMAR units, and 15 (9.0%) worsened by at least 0.3 LogMAR units. 119 (71.7%) eyes had a visual acuity of 6/60 or better, and 27 (16.3%) were counting fingers or worse. Only 16 (11.1%) patients had a vision of <6/60 in both eyes at latest follow-up. Preoperative vision in both the operated eye and the contralateral eye, macular detachment, and long-acting intraocular tamponade were independent predictors of poor postoperative vision, but this model accounted for only a small proportion of the observed variation in outcomes.
  
  
  CONCLUSIONS
  Major complications are rare after vitrectomy for proliferative diabetic retinopathy, and >70% of eyes will regain vision of 6/60 or better. Visual outcomes remain unpredictable.
authors.affiliation: Tennent Institute of Ophthalmology, Gartnavel Hospital, Great Western Road, Glasgow G12 0YN, Scotland, UK. dhyorston@enterprise.net
authors.forename: D
authors.initials: D
authors.lastname: Yorston
authors.forename: L
authors.initials: L
authors.lastname: Wickham
authors.forename: S
authors.initials: S
authors.lastname: Benson
authors.forename: C
authors.initials: C
authors.lastname: Bunce
authors.forename: R
authors.initials: R
authors.lastname: Sheard
authors.forename: D
authors.initials: D
authors.lastname: Charteris
mesh_terms: D000328:Adult; D000368:Aged; D003922:Diabetes Mellitus, Type 1 / Q000150:complications; D003924:Diabetes Mellitus, Type 2 / Q000150:complications; D003930:Diabetic Retinopathy / Q000473:pathology / Q000503:physiopathology / Q000601:surgery*; D004812:Epidemiologic Methods; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D012163:Retinal Detachment / Q000209:etiology; D016896:Treatment Outcome; D014792:Visual Acuity; D014821:Vitrectomy / Q000009:adverse effects; D014823:Vitreous Hemorrhage / Q000209:etiology