Establishment and Validation of a Risk Prediction Model for Long-term Low Vision After Vitrectomy in PDR Patients

Inclusion Criteria

• •Voluntary and able to sign an informed consent form
• •Age ≥18 years
• •Documented diagnosis of diabetes mellitus (type I or type II diabetes) defined by the American Diabetes Association or World Health Organization criteria.
• •Unabsorbed vitreous hemorrhage lasted for more than 2 weeks, with or without tractional retinal detachment examen by slit lamp, B-ultrasound and fundus color photography.