Blocked blood flow may bring strokes in some parts of the body, including the eye. Eye blockage is caused by damage on vital structures such as retina and optic nerve. Nutrients and oxygen can no longer flow through your blood, so that eye strokes occur. eye exams can search out signs of an eye occlusion. There are several types of eye occlusion, depending on the location they are found.
A painless branch retinal artery occlusion (BRAO) can cause peripheral vision and central vision loss. Main reason for BRAO is a clot in the carotid or from certain valve in the heart. A BRAO can lead to visual acuity loss if the arterial blood flow is disrupted or the macula is swelling. “Symptoms” of a BRAO include narrowing carotid, high blood pressure, cardiac disease or combinations of these conditions. Ocular massage can be applied to treat acute or sudden arterial occlusion. And a glaucoma medication can be used to dislodge the embolus within 12 to 24 hours after a BRAO happens. The majority of patients with BRAO can restore visual acuity of 20/40 or better and complications such as neovascular glaucoma are rare.
Another type of occlusion is branch retinal vein occlusion (BRVO), which may cause decreased vision, peripheral vision loss or blind spots. As its name reflects, BRVO is caused by a localized clot in a branch retinal vein. BRVO always occurs in people with high blood pressure accompanied by retinal bleeding. BRVO patients should receive eye exams every one to two months, in order to detect potential conditions such as macular swelling and neovascularization. Persistent macular edema requires a laser treatment named laser photocoagulation. And significant neovascularization requires a pan-retinal laser photocoagulation. Most patients can resume a 20/40 vision after treatments.
Central retinal artery occlusion (CRAO) always affects only one eye and leads to womens vision loss. CRAO is mostly caused by a clot from the neck artery or the heart, which blocks blood flow to the retina. CRAO patients usually also suffer from high blood pressure and carotid artery disease, cardiac valvular disease or diabetes. Symptoms of a CRAO can be pale retina and narrowed vessels. Your doctor may use a fluorescein angiogram to determine that if you have a CRAO. Within 24 hours after acute vision loss begins, your doctor can take some treatments such as glaucoma medications for eye pressure decrease, ocular massage and a minor surgery named an anterior chamber paracentesis. Statistics show that most patients suffer severe visual loss.
A fourth type of occlusion is central retinal vein occlusion (CRVO). CRVO patients always have mild to severe hemorrhages and cotton-wool spots in the retina. There are still two types of CRVO: ischemic and non-ischemic. Non-ischemic CRVO is more easily to treat than ischemic CRVO. Ischemic CRVO always bring dissatisfying visual acuity and other complications. If the initial vision is bad, a CRVO will result in severe visual acuity. The evaluation of signs for neovascularization or abnormal vessel growth is also important. The treatment for both two types of CRVO is usually a pan-retinal photocoagulation.