The effects of panretinal photocoagulation on dark adaptation in diabetics with proliferative retinopathy

The dark adaptation of 14 diabetic patients was measured before and after panretinal photocoagulation (PRP). The rod-cone break of diabetics prior to PRP was delayed 1.7 minutes compared to normal controls and the final rod threshold was elevated 0.7 log units. After PRP, the rod-cone break was delayed 2.9 minutes and the final rod threshold was elevated 1.1 log units.