We observed pathologic changes of PDR, such as vitreous hemorrhage, posterior detachment of vitreous, tractional detachment of retina, vitreous organization, preretinal membranes.

• 对PDR各种病理改变：如玻璃体积血、玻璃体后脱离、牵引性视网膜脱离、玻璃体机化和视网膜前膜的诊断符合率达到94%25。