The purpose of the study is to explore the current incidence rate of retinopathy of prematurity (ROP) in China and to explore more appropriate screening criteria for ROP.
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Death before the first screening;
Death or loss to follow-up before complete retinal vascularization;
Presence of other diseases causing incomplete retinal vascularization, such as familial exudative vitreoretinopathy, incontinentia pigmenti, or Coats disease;
Coexisting conditions affecting the classification or staging of ROP, such as corneal opacity, congenital cataract, persistent fetal vasculature, retinoblastoma, anophthalmia, Terson syndrome, or other ocular infections or diseases;