Our result demonstrate that the birth weight have relations with the severity of ROP and cryotherapy is an effective treatment for the active stage Ill retinopathy of prematurity.

• 早产儿的出生体重和其视网膜病变的严重程度有关且冷冻治疗可以抑制活跃性的纤维血管组识之恶化并助其吸收，对于第三期早产儿视网膜病变有治疗效果。