糖尿病视网膜病可分为非增殖性糖尿病视网膜病(NPDR)或增殖性糖尿病视网膜病(PDR)。NPDR是早期阶段,视网膜内的小血管渗出液体或血液。此时视力仍然良好。但是,当渗漏涉及到黄斑部(黄斑水肿)时,视力将受到影响。当异常血管在视网膜表面生长时,将造成PDR。异常血管的生长是由于视网膜血管严重受损而导致流向视网膜的血液不足。这将造成疤痕或视网膜脱落,从而导致视力丧失。
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