[Panretinal photocoagulation with or without focal photocoagulation--the effect on central retinal thickness]

To assess the effect of panretinal photocoagulation (with or without focal macular photocoagulation) on central retinal thickness measured by OCT METHOD: Prospective, interventional, non-comparative case series. Panretinal photocoagulation (PRP) was performed in 3 sessions in 28 eyes with proliferative diabetic retinopathy In 9 eyes who had also initial macular edema we have associated focal macular laser treament concomitant with the first PRP session. Macular thickness was assessed by optical coherence tomography at baseline and after 4 and 10 weeks.

Baseline mean central retinal thickness was 252 +/- 95 microm. It was modified to 260 +/- 105 microm at 4 weeks, then to 232 +/- 49 microm at 10 weeks. There was no statistical significance of these variations. In 2 eyes (7, 14%) we have noticed an increase of more than 100 microm in central retinal thickness. In the subgroup of 9 eyes with associated initial macular edema, combined PRP-focal treatment resulted in the decrease of central retinal thickness from 306 +/- 123 microm to 236 +/- 49 microm at 10 weeks.

Panretinal photocoagulation can be associated with a significant increase of central retinal thickness in a small percentage of eyes. The PRP-focal macular laser combination is effective in eyes who present with proliferative diabetic retinopathy and macular edema.