title: Cataract surgery in patients with diabetic retinopathy: visual outcome, progression of diabetic retinopathy, and incidence of diabetic macular oedema.
abstract: BACKGROUND
  Compared to non-diabetic patients, outcome after cataract surgery was reported to be worse in diabetic patients--especially in those with diabetic retinopathy. This prospective study was planned to evaluate visual outcome, progression of diabetic retinopathy, and incidence of clinically significant macular oedema (CSME) in a homogenous group of patients with non-proliferative diabetic retinopathy (NPDR) without CSME at baseline 1 year after cataract surgery.
  
  
  METHODS
  Over a period of 18 months, all consecutive patients with mild-to-moderate diabetic retinopathy who had cataract surgery with phacoemulsification and posterior chamber lens implantation were prospectively followed up. Outcomes were assessed 1 year postoperatively and included visual acuity (VA), progression of retinopathy, and incidence of CSME. Progression of retinopathy and incidence of CSME were compared to the non-operated fellow eyes.
  
  
  RESULTS
  Of 50 patients included, 42 completed the 1-year follow-up. VA improved in 85% of patients, and was better than 0,5 in 71%. Progression of retinopathy occurred in 12% of eyes after cataract surgery and in 10.8% of non-operated fellow eyes. No patient developed proliferative diabetic retinopathy in the operated eye. CSME occurred in 13 operated eyes (31%), five of them with retinal ischemia, and in five non-operated eyes (13.5%). Patients with ischemic macular oedema had the worst prognosis regarding VA.
  
  
  CONCLUSIONS
  Modern cataract surgery seems to have no influence on the progression of diabetic retinopathy. A visual improvement is achieved in the majority of patients with NPDR, but poorer visual outcome is observed in patients developing macular oedema.
authors.affiliation: Department of Ophthalmology, University of Vienna, Währinger Gürtel 18-20, 1090 Vienna, Austria. katharina.krepler@akh-wien.ac.at
authors.forename: Katharina
authors.initials: K
authors.lastname: Krepler
authors.forename: Robert
authors.initials: R
authors.lastname: Biowski
authors.forename: Susanne
authors.initials: S
authors.lastname: Schrey
authors.forename: Kerstin
authors.initials: K
authors.lastname: Jandrasits
authors.forename: Andreas
authors.initials: A
authors.lastname: Wedrich
mesh_terms: D000368:Aged; D002386:Cataract / Q000150:complications / Q000503:physiopathology; D003924:Diabetes Mellitus, Type 2 / Q000150:complications; D003930:Diabetic Retinopathy / Q000150:complications* / Q000503:physiopathology; D018450:Disease Progression; D005260:Female; D006801:Humans; D015994:Incidence; D019654:Lens Implantation, Intraocular; D008269:Macular Edema / Q000209:etiology*; D008297:Male; D018918:Phacoemulsification; D011446:Prospective Studies; D014792:Visual Acuity / Q000502:physiology*