There.s a strong association between non-infectious retinal microvasculopathy and retinal vein occlusions. The possibility of still more long-term complications cannot be ruled out. This treatment, while important in helping to prevent further visual loss, is not usually associated with improvement in vision. Retinal vein occlusion may demonstrate distended and convoluted veins, along with congestion and swelling in the eye's interior region including the retina. The type depends on which type of blood vessel is affected: Retinal artery occlusion is a blockage of one of the retinal arteries, which are blood vessels that carry oxygenated blood from the heart to your retina. Arch Ophthalmol. 2009 Se. 1279:1101-14. Some of the changes to your vision may be caused by the swelling and bleeding the blood backing up causes. Medline .
Hayreh SS. RPO is further subdivided into nonischemic and ischemic types, according to the amount of retinal capillary ischemia seen by the ophthalmologist on fluoresce in angiography. In: rake RE, ed. The authors of these two latter series claimed that none of the eyes with successful anastomosis progressed to ischemic CRVO. Retina. 2008 Oct. 288:1044-52. However, it’s possible for one of the vessels carrying blood to or from the retina to become blocked or have a blood clot.