The prevalence of DRP was 24 9%, among which the prevalence of BDP and PDR was 21 0% and 3 9% respectively.

• DRP的总患病率为 2 4 9%25 ,其中背景性视网膜病变和增殖性视网膜病变分别为 2 1 0%25和 3 9%25 ;