1. Complications included preretinal hemorrhage, residue of macular pucker, recurrent retinal detachment, nuclear cataract.

2. The preretinal ribbon like echo was classified into 4 different types.

3. We report a case of peripapillary arterial loop associated with preretinal and vitreous hemorrhage.

4. The formation of subretinal membrane is earlier than that of the preretinal membrane and appeared extensively in TPVR.

5. The changes of retinal vessels of mice were observed by ADPase histochemical technique and HE staining was used to count preretinal neovascular nuclei.