Published: 03 December 2020

What does blood in the back of the eye signify, anyway? It could be a retinal vein occlusion, an ocular disorder that can occur in older people where the blood vessels to the retina are blocked. The retina is the back part of the eye where light focuses and transmits images to the brain. Blockage of the veins in the retina can cause sudden vision loss. The severity of vision loss depends on where the blockage is located. Blockage at smaller branches in the retinal vein is referred to as branch retinal vein occlusion (BRVO). Vision loss in BRVO is usually less severe, and sometimes just parts of the vision is blurry. Blockage at the main retinal vein of the eye is referred to as central retinal vein occlusion (CRVO) and results in more serious vision loss. Sometimes blockage of the retinal veins can lead to abnormal new blood vessels developing on the surface of the iris (the colored part of your eye) or the retina. This is a late complication of retinal vein blockage and can occur months after blockage has occurred. These new vessels are harmful and can result in high eye pressure (glaucoma), and bleeding inside the eye. What are the symptoms of a retinal vein occlusion? Symptoms can range from painless sudden visual loss to no visual complaints. Sudden visual loss usually occurs in CRVO. In BRVO, vision loss is usually mild or the person can be asymptomatic. If new blood vessels develop on the iris, then the eye can become red and painful. If these new vessels grow on the retina, it can result in bleeding inside the eye, causing decreased vision and floaters – spots in your vision that appear to be floating. Causes of retinal vein occlusion Hardening of the blood vessels as you age is what predisposes people to retinal vein occlusion. Retinal vein occlusion is more common in people over the age of 65. People with diabetes, high blood pressure, blood-clotting disorders, and glaucoma are also at higher risk for a retinal vein occlusion. How is retinal vein occlusion diagnosed? A dilated eye exam will reveal blood in the retina. A fluorescein angiogram is a diagnostic photographic test in which a colored dye is injected into your arm and a series of photographs are taken of the eye to determine if there is fluid leakage or abnormal blood vessel growth associated with the vein occlusion. An ultrasound or optical coherence tomography (OCT) is a photo taken of the retina to detect any fluid in the retina. Treatment for retinal vein occlusion Not all cases of retinal vein occlusion need to be treated. Mild cases can be observed over time. If there is blurry vision due to fluid in the retina, then your ophthalmologist may treat your eye with a laser or eye injections. If new abnormal blood vessels develop, laser treatment is performed to cause regression of these vessels and prevent bleeding inside the eye. If there is already a significant amount of blood inside the eye, then surgery may be needed to remove the blood. Outlook after retinal vein occlusion Prognosis depends on the severity of the vein occlusion. Usually BRVO has less vision loss compared to CRVO. The initial presenting vision is usually a good indicator of future vision. Once diagnosed with a retinal vein occlusion, it is important to keep follow-up appointments to ensure that prompt treatment can be administered to best optimize your visual potential.

Published: 02 December 2020

And old Creek Indian proverb states, "We warm our hands by the fires we did not build, we drink the water from the wells we did not dig, we eat the fruit of the trees we did not plant, and we stand on the shoulders of giants who have gone before us." In 1961, the Eye Bank Association of America (EBAA) was formed. This association stewards over 80 eye banks in the US with over 60,000 recipients each year of corneal tissue that restores sight to blind people. Over one million men, women, and children have had vision restored and pain relieved from eye injury or disease. The Eye Bank Association of America is truly a giant whom shoulders that we stand upon today. Their service and foresight into helping patients with blindness is remarkable. It is important to give back the gift of sight. You may be asking, “how does this affect me?” On the back of your drivers license form there is a box that can be checked for being an organ donor. Many people forego this option because they are not educated on the benefits of it. There are many eye diseases that rob people of sight because of an opacity, pain, or disease process of the cornea. Keratoconus, a disease that causes malformation of the curvature of the cornea, can be treated by a corneal transplant. Chemical burns that cause scarring on the cornea leave people blinded or partially blind. This is another condition that requires a corneal transplant. When it comes to corneal tissue, virtually everyone is a universal donor, because the cornea is not dependent on blood type. Corneal transplant surgery has a 95% success rate. According to a recent study by EBAA, eye disorders are the 5th costliest to the US economy behind heart disease, cancer, emotional disorders, and pulmonary disease. The cost is incurred when the person, for example, is a working age adult and can no longer hold a job because of vision issues. The gift of a corneal transplant can be one way to restore not only their vision, but their way of life, and their contribution to society. By becoming a donor, or educating others to consider being an organ donor, you can give the gift of sight to someone on a waiting list. When you educate others to give the precious gift of sight, you become a giant whose shoulders others can stand on. Become a donor today. For more information go to www.restoresight.org or contact your local drivers license office.