Purpose: To evaluate the results of PRK performed between 1990 and 1994 in Wroclaw University Eye Clinic.
Materials and methods: PRK was performed in 630 eyes with: (1) PDR--451 immediately treated eyes (moderate PDR--184 eyes, with "high-risk" characteristics--227 eyes, PDR advanced--after cryopexion--40 eyes); (2) severe NPDR--119 eyes (with PDR in fellow eye or with ME) and (3) less severe DR--60 eyes treated with immediate or delayed, full or mild scatter coagulation (with macular edema, both eye moderate NPDR, other systemic risk factors). Follow-up treatment: Additional scatter or local photocoagulation was performed in 34 cases increasing activity of neovascularisation or increase in frequency/extend of vitreous hemorrhage.
Results: In a period 3 to 36 months of follow-up (mean period = 25 months) in the group of 451 eyes with PDR 28.2% of eyes showed visual improvement, 48.3% of eyes showed no change and 23.5% of eyes worsened. In the group of 119 eyes with severe NPRD 75.6% showed visual improvement and 24.4% showed no change. In the group of 60 eyes with less severe DR 27.8% showed improvement, 36.7% showed no change and 35.5% worsened.
Conclusion: Our results are relatively good and in agreement with other studies.