Quantitative study of retinal function by laser photocoagulation for superior temporal branch retinal vein occlusion

Abstract

Objective To observe changes in retinal function before and after laser photocoagulation for superior temporal branch retinal vein occlusion.Methods Implemented laser photocoagulation to 32 cases (32 eyes) superior temporal branch retinal vein occlusion patients; before treatment,after a month,three months and six months visual field and multifocal electroretinogram were researched quantitatively.Results The fovea,central 10° visual field mean light sensitivity before and after photocoagulation were not statistically different (P ＞0.05); near the center of 11°～30° range mean light sensitivity a month after photocoagulation descended (P ＜0.01),three months,six months later were no statistical difference compared with that before treatment (P ＞0.05).Superior temporal quadrant mean light sensitivity declined one month,three months after photocoagulation (P ＜0.05),had no statistical difference six months later (P ＞0.05).Amplitude density of P1 wave in superior temporal quadrant dropped a month after photocoagulation (P ＜0.05),three months,six months later had no statistical difference with that of before treatment (P ＞0.05).Conclusions Laser photocoagulation can effectively protect the central visual function of superior temporal branch retinal vein occlusion,but the effect on retinal function of photocoagulation region should undergo a gradual,injury and repair process. Key words: Superior temporal branch retinal vein occlusion; Laser photocoagulation; Perimetry; Multifocal electroretinogram