Abstract: 532 nm laser photocoagulation is an established method to induce choroidal neovascularization (CNV) in rodents. 532 nm laser photocoagulation is an established method for inducing CNV in rodents. The aim of this study was to evaluate the degree of morphological variation of laser-induced CNV in vivo and in vitro over time so as to provide an observational metric for future CNV-related experiments. In this experiment, brown Norway rats were first laser-molded. Subsequently, in vivo fundus photography, optical coherence tomography (OCT), fundus fluorescence angiography (FFA) and indocyanine green angiography (ICGA) were performed according to different time points, and finally histopathological examination was applied for in vitro validation.The results showed that CNV appeared at 7th day after photocoagulation, with the highest total incidence of CNV at 21th day. FFA showed typical disc-like strong fluorescence leakage, while ICGA displayed strong fluorescence at the periphery of the photocoagulation area and low fluorescence in the center with a wreath-like morphology. Subretinal CNV were formed 7th day after molding as seen under optical microscope. The central thickness of the CNV gradually increased from 7th to 21th day and remained relatively stable until 28th day. This suggests that the modeling approach utilizing 532 nm laser-induced BN rats with CNV exhibits a short duration and high success rate, rendering it applicable for preclinical experimental studies and providing insights for further research on the pathogenesis of CNV.
Key words: laser-induced; 532 nm; choroidal neovascularization; animal model; brown Norway rats
（Acta Laser Biology Sinica, 2023, 32(4): 321-329）