Recording the retinal thickness of central fovea of macula by optical coherencetomography in pre-photocoagulation and post-photocoagulation after 3 months.

• 在光凝前、光凝后3个月分别进行扫描获取光学相干断层扫描图像,记录黄斑中心凹视网膜厚度,作统计学分析。