{"id":16476,"date":"2021-07-28T12:34:46","date_gmt":"2021-07-28T12:34:46","guid":{"rendered":"https:\/\/www.optometrists.org\/?page_id=16476"},"modified":"2021-12-13T11:51:15","modified_gmt":"2021-12-13T11:51:15","slug":"central-retinal-vein-occlusion","status":"publish","type":"page","link":"https:\/\/www.optometrists.org\/general-practice-optometry\/guide-to-eye-conditions\/guide-to-retinal-diseases\/central-retinal-vein-occlusion\/","title":{"rendered":"Central Retinal Vein Occlusion"},"content":{"rendered":"<h2><b>Over 2.5 million adults are affected by CRVO, every year.<\/b><\/h2>\n<p>The central retail vein drains all the blood from the retina, carry away carbon dioxide and waste products. Any damage to this vein can cause <a href=\"https:\/\/www.optometrists.org\/general-practice-optometry\/guide-to-eye-conditions\/guide-to-retinal-diseases\/retinal-diseases\/\">sudden retinal disease<\/a> and dramatic vision loss and blindness.<\/p>\n<h2><b>Central retinal vein occlusion (CRVO)<\/b><\/h2>\n<p>Central retinal vein occlusion (CRVO) is a <a href=\"https:\/\/www.optometrists.org\/general-practice-optometry\/guide-to-eye-conditions\/guide-to-retinal-diseases\/retinal-diseases\/\">serious retinal condition<\/a> in which the main vein that drains blood from the retina becomes blocked or closes off partially or completely.<\/p>\n<p>There are two types of CRVO:<\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Non-ischemic CRVO<\/b> &#8211; a mild type characterized by leaky retinal vessels with macular edema<\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Ischemic CRVO<\/b>\u2014a more severe type with closed-off small retinal blood vessels<\/li>\n<\/ul>\n<h2><b>What causes CRVO?<\/b><\/h2>\n<p>CRVO affects one eye in the majority of patients. CRVO has no established etiology, despite the fact that diabetes and high blood pressure are risk factors.<\/p>\n<p>What we do know is that CRVO is caused by a blood clot or decreased blood flow in the retina&#8217;s central retinal vein.<\/p>\n<p>CRVO that occurs in both eyes at the same time can be related to systemic disease. If this is the case, a tendency toward irregular blood clotting is definitely more common and medical testing to detect thrombophilia (an increased tendency to develop blood clots) is indicated.<\/p>\n<h2><b>Symptoms of CRVO<\/b><\/h2>\n<p>Non-ischemic CRVO may show no symptoms. However, many patients with CRVO have symptoms such as blurry or distorted vision due to swelling of the macula (center part of the retina). Some patients have mild symptoms that appear and disappear, called transient visual obscurations.<\/p>\n<p><b>Patients with ischemic CRVO have worse vision and have a lower likelihood of recovery.<\/b><\/p>\n<p>These patients have a tendency to generate new blood vessels in the eye, which can obstruct the outflow of normal ocular fluids in the front of the eye.<\/p>\n<p>Glaucoma may also develop as the ocular pressure rises. New blood vessels in the rear of the eye may produce bleeding. Patients may also experience pain, redness, and irritation.<\/p>\n<p><strong>SEE RELATED: <a href=\"https:\/\/www.optometrists.org\/general-practice-optometry\/guide-to-eye-conditions\/guide-to-retinal-diseases\/\">Guide to Retinal Disease<\/a><\/strong><\/p>\n<p><b>If you\u2019ve experienced sudden loss of vision or eye pain<\/b>, <b><a href=\"https:\/\/www.optometrists.org\/practice-search\/\">contact an eye doctor near you<\/a>.<\/b><\/p>\n\n\t<div class=\"practice-search-widget\">\n\t\t<h3>Find an eye doctor near you<\/h3>\n\t\t\n\t<form class=\"practice-search-form practice-search-form-widget\" action=\"https:\/\/www.optometrists.org\/practice-search\/results\/\" method=\"get\">\n\n\t\t<input type=\"hidden\" name=\"distance\" value=\"100\" class=\"practice-search-distance\">\n\t\t<input type=\"hidden\" name=\"page\" class=\"practice-search-page\">\n\t\t<input type=\"hidden\" name=\"address_latitude\"><input type=\"hidden\" name=\"address_longitude\">\n\n\t\t<input type=\"text\" name=\"address\" class=\"practice-search-address\" placeholder=\"City, Surburb or Address\" value=\"\">\n\n\t\t\n\t\t\t<input type=\"hidden\" name=\"distance\" value=\"100\" class=\"practice-search-distance\">\n\n\t\t\n\n\t\t<button type=\"submit\" class=\"practice-search-button\">\n\t\t\t\t\t\t\t\t\t<svg width=\"19\" height=\"19\" viewBox=\"0 0 19 19\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path fill-rule=\"evenodd\" clip-rule=\"evenodd\" d=\"M10.6796 0.130005C9.15708 0.130059 7.66615 0.5646 6.38198 1.38258C5.09781 2.20057 4.07373 3.36803 3.43004 4.74783C2.78634 6.12763 2.54976 7.66246 2.74808 9.17205C2.9464 10.6816 3.57139 12.1033 4.54964 13.27L0.729639 17.08C0.6364 17.1732 0.562439 17.2839 0.511979 17.4058C0.461519 17.5276 0.435547 17.6581 0.435547 17.79C0.435547 17.9219 0.461519 18.0524 0.511979 18.1743C0.562439 18.2961 0.6364 18.4068 0.729639 18.5C0.917942 18.6883 1.17334 18.7941 1.43964 18.7941C1.5715 18.7941 1.70207 18.7681 1.82389 18.7177C1.94571 18.6672 2.0564 18.5932 2.14964 18.5L5.99964 14.62C7.35406 15.6038 8.98566 16.1324 10.6596 16.13C12.7814 16.13 14.8162 15.2871 16.3165 13.7869C17.8168 12.2866 18.6596 10.2517 18.6596 8.13C18.6596 6.00827 17.8168 3.97344 16.3165 2.47315C14.8162 0.97286 12.7814 0.130005 10.6596 0.130005H10.6796ZM10.6796 14.13C9.49295 14.13 8.33291 13.7781 7.34622 13.1188C6.35952 12.4595 5.59049 11.5225 5.13636 10.4261C4.68224 9.32975 4.56342 8.12335 4.79493 6.95946C5.02644 5.79558 5.59788 4.72648 6.437 3.88736C7.27611 3.04825 8.34521 2.4768 9.5091 2.24529C10.673 2.01378 11.8794 2.1326 12.9757 2.58673C14.0721 3.04085 15.0092 3.80989 15.6685 4.79658C16.3277 5.78328 16.6796 6.94332 16.6796 8.13C16.6796 9.7213 16.0475 11.2474 14.9223 12.3726C13.7971 13.4979 12.2709 14.13 10.6796 14.13Z\" fill=\"#fff\"\/><\/svg>\n\t\t\t\t\t<\/button>\n\n\t\t<button type=\"button\" class=\"practice-search-use-my-location\">\n\t\t\tSearch near me\n\t\t<\/button>\n\n\n\t<\/form>\n\n\n\n\t\t<\/div>\n\n\t\n<h2><b>How is CRVO diagnosed?<\/b><\/h2>\n<p>CRVO is usually diagnosed clinically, based on medical indications and symptoms described by the patient.<\/p>\n<p><b>When a retina specialist examines the back of the eye, <a href=\"https:\/\/www.optometrists.org\/general-practice-optometry\/guide-to-eye-exams\/eye-exams\/what-is-a-digital-retinal-image\/\">using digital imaging<\/a>, a distinct pattern of retinal hemorrhages is visible, and a diagnosis is made.<\/b><\/p>\n<p>Diabetic retinopathy and retinopathy caused by low blood counts, such as anemia and thrombocytopenia (a deficiency of blood platelets), are two common diseases that can mimic CRVO.<\/p>\n<p>Macular edema, or swelling of the center of the retina, is common, and an <a href=\"https:\/\/www.optometrists.org\/general-practice-optometry\/guide-to-eye-exams\/eye-exams\/what-is-an-oct-eye-exam\/\">optical coherence tomography (OCT)<\/a> scan is frequently obtained to detect this and assess the extent of swelling.<\/p>\n<p>Fluorescein angiography (FA) imaging may be used to help distinguish CRVO from disorders that are similar to it, as well as to assess the closure of small blood vessels and to look for or confirm the formation of new abnormal vessels.<\/p>\n<h2><b>CRVO treatment<\/b><\/h2>\n<p>About one-third of older patients who receive no treatment improve on their own, one-third wax and wane and stay about the same, and one-third deteriorate..<\/p>\n<p>The vascular endothelial growth factor (VEGF) is raised in people with CRVO, which causes swelling and the formation of new vessels that are prone to bleeding.<\/p>\n<p>The most popular treatment, which is based on the outcomes of large randomized clinical trials, involves <a href=\"https:\/\/www.optometrists.org\/general-practice-optometry\/guide-to-eye-conditions\/guide-to-diabetes-and-the-eyes\/how-is-diabetic-retinopathy-treated\/how-do-anti-vegf-injections-work\/\">injecting an anti-VEGF medicine<\/a> into the eye on a regular basis to prevent new blood vessel formation and swelling.<\/p>\n<p>Another option for treating macular edema from CRVO is with an injection of intraocular steroid.<\/p>\n<p><strong>LEARN MORE: <a href=\"https:\/\/www.optometrists.org\/general-practice-optometry\/guide-to-eye-health\/\">Guide to Eye Health<\/a><\/strong><\/p>\n<p><b>Schedule an appointment with an eye doctor near you who can diagnose and treat CRVO, early treatment might save your vision.<\/b><\/p>\n<p><em>CRVO is a serious eye condition, requiring urgent medical care. <\/em><\/p>\n<p><em>Early diagnosis of macular edema or abnormal blood vessels is critical; most people can prevent serious vision loss if treatment is started before significant damage to the eye occurs.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Over 2.5 million adults are affected by CRVO, every year. The central retail vein drains all the blood from the retina, carry away carbon dioxide<\/p>\n","protected":false},"author":4,"featured_media":16477,"parent":20096,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"template-article.php","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-16476","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Central Retinal Vein Occlusion - Optometrists.org<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.optometrists.org\/general-practice-optometry\/guide-to-eye-conditions\/guide-to-retinal-diseases\/central-retinal-vein-occlusion\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Central Retinal Vein Occlusion - Optometrists.org\" \/>\n<meta property=\"og:description\" content=\"Over 2.5 million adults are affected by CRVO, every year. 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