RESUMO
The pathomorphological features of proliferative vitreoretinopathy (PVR) were studied in the presence or absence of an extraocular focus of chronic infection. The study was performed on 60 Chinchilla rabbits. In experimental animal group 1, the left eyes were used to simulate a thrombocytic model of PVR; physiological sodium chloride solution was injected into the right eyes that served as control. In Group 2 animals, a chronic infection focus had been previously reproduced by subcutaneously injecting 0.2 ml of BGC vaccine into the nasal bridge and PVR was simulated 2 weeks later. A comparative study of hematoxylin- and eosin-stained histological specimens from the eyes of Groups 1 and 2 animals, a study of the cellular composition on semithin sections, and electron microscopy showed a poor course of the proliferative process in the presence of an extraocular focus of chronic infection. In the presence of a chronic infection focus, PVR is constantly maintained; it takes a severer course for a longer period while in its absence the proliferative process tends to regress.
