The Retina is the layer of light-sensing cells lining the back of your eye. It converts light rays into signals. Which are sent through the optic nerve to your brain where they are recognized as images. A blocked vein damages the blood vessels of the retina.hemmorrhages (bleeding) and leakage of fluid occurs from the areas of blocked blood vessels.
There are two different types of retina vein occlussion:
. Central retina vein occlusion (CRVO): When the main vein of the eye (located at the optic nerve) becomes blocked: and
. Branch retina vein occlusion (BRVO): when one of the smaller branches of vessels attached to the main vein becomes blocked.
WHO IS AT RISK FOR A RETINA VEIN OCCLUSSION?
Certain illness increase your risk for developing retina vein occlusion, including:
.high blood pressure:
.age-related vascular (blood vessel) disease:
. Blood disorders
WHAT ARE THE COMPLICATIONS AND SYMPTOMS OF RETINAL VEIN OCCLUSION?
If blood and fluid leak into the central part of the retina called the macula, swelling of the macula occurs (called macular edema). The macula is the part of your retina responsible for your fine detail vision.It is what allows you to read small print, thread a needle,and read street signs. Macular edema causes blurred and/or decreased vision.
Abnormal blood vessel growth (neovascularization).
Retina vein occlussion can cause abnormal vessels to begin to grow in the retina. These new vessels are very fragile and may bleed or leak fluid into the vitreous-the gel-like substance that fills the center of the eye.small spots or cloud in your field of vision called floaters can appear. In more advanced cases of neovascularization,the abnormal blodd vessels may actually cause the retina to detach from the back of the eye.
Pain in the Eye.
In severe cases of CRVO, a blocked vein causes abnormal blood vessel growth (rubeosis) leading to painful pressure in the eye.If complications from retina vein occlussion are not treated, irreversible blindness may occur.
HOW IS RETINA VEIN OCCLUSSION DETECTED?
Your Ophthalmologist (Eye M.D) detects retina vein occlusion by examining the retina with an instrument called an Opthalmoscope. He or she may also perfom fluorescein angiography, a procedure that takes special photographs of the eye, in order to futher investigate the blood vessels in your eye.
HOW IS RETINA VEIN OCCLUSION TREATED?
There is no known cure for retina vein occlussion,though in some cases laser surgerymay be used to reduce the macular edema and stabilize or improve vision. In severe CRVO, laser surgery is used to prevent or treat the abnormal blodd vessel growth that can lead to glaucoma.
You may be able to prevent retina vein occlusion from occurring again by properly managing any health conditions that contribute to this eye problem (such as diabetes, glaucoma or high blood pressure).