[Indocyanine green videoangiography of the choroidal circulation in the experimental retinal opacity induced by blunt trauma].

Retinal opacity was experimentally induced by blunt trauma to the rabbit eye and the damage to the choroidal circulation was investigated immediately thereafter by using indocyanine green (ICG) videoangiography. Ten pigmented rabbit eyes were used. In the early phase, the defect of choroidal inflow (10 eyes), the twitch of the choroidal artery (2 eyes) and the reflux of the vortex vein (5 eyes) could be observed dynamically. The defect of choroidal inflow showed its peak around the point where the choroidal arteries branched off from ciliary arteries and disappeared within a few second to over ten seconds. The reflux from the vortex vein seemed to be important as collateral pathway. In the middle phase, several points of ICG leakage were observed around the apex of the delayed area of choroidal circulation (9 eyes). This ICG leakage was intra-choroidal and seemed to be caused by the breakdown of the great vessels at the outer layer of the choroid. This study indicates that ICG videoangiography could observe various choroidal circulatory disturbances following blunt trauma and may be useful in delineating the pathogenesis of retinal opacity.