[Experimental retinal branch vein occlusion]

Experimental retinal branch vein occlusion was produced in monkeys (macaca irus) by dye laser photocoagulation (yellow wavelength 577nm The 920 ARGON/DYE Laser System, Coherent Radiation). The Clinical process was observed based on ophthalmoscopic and fluorescein angiographic alterations which occur during the natural history of experimental branch vein occlusion. Immediately after occlusion, venous dilatation, retinal edema and punctate hemorrhage, were recognized by ophthalmoscopy, and leakage of dye from postcapillary venules, followed later by additional leakage from large veins were observed frequently by fluorescein angiography. Circulatory disturbances remained over 3-4 days, and the retinal branch vein occlusion were persisted. Ten days later, a non-perfusion area was observed by fluorescein angiography. More than 1 year later, these nonperfusion area remained.