Comparison of navigated laser and conventional single-spot laser system for induced pain during panretinal photocoagulation

Abstract

To compare the panretinal photocoagulation (PRP)-induced pain response between novel navigated laser (Navilas) and conventional single-spot laser. The eyes were randomly assigned to Navilas or conventional laser. Contralateral eyes underwent PRP with the other system with 30 min resting interval. Pulse duration was 100 ms in conventional laser and 30 ms or 100 ms in Navilas and power setting was enough to create gray-white light burn on both devices. Pain response was evaluated by verbal scale (VS) (0-4) and visual analog scale (VAS) (0-10) after each PRP application. The mean age of 70 patients (140 eyes) was 62.52 +/- 9.49 years. Mean power and spot numbers for Navilas and conventional laser were 291.9 +/- 85.3 mW vs 368.4 +/- 72.0 mW, and 375.4 +/- 108.4 vs 374.2 +/- 105.0 (p < 0.001 and p = 0.53, respectively). Pain scores for Navilas and conventional laser were 1.19 +/- 0.73 and 1.99 +/- 0.84 for VS and 2.41 +/- 1.65 and 4.74 +/- 2.17 for VAS (p < 0.001 and p < 0.001). More comfortable PRP is achieved with Navilas system in comparison with conventional single-spot laser system. However, small number of patients treated with same pulse duration and different contact lenses used for two systems should be taken into consideration. Besides, we did not report comparative clinical efficiency of either laser system.