Blockage of a blood vessel that carries blood away from the retina. The blockage is usually caused by a diseased arterial wall compressing the venous wall at a crossing point or by a blood clot. Retinal vein occlusion impairs sight if swelling or ischemia (poor blood flow) occurs in the center of the retina. Often the blood and fluid are absorbed naturally, and vision may return to normal. If the blood persists, the change in vision may be permanent. Laser therapy may treat any persistent swelling of the retina.
The obstruction of a vein responsible for transporting blood from the retina, which is the light-sensitive inner layer located at the back of the eye. This typically occurs due to the formation of abnormal blood clots within the affected vein, and it’s more prevalent among individuals with glaucoma—a condition marked by elevated fluid pressure within the eye. Retinal vein occlusion can impact either the primary retinal vein or one of its branches.
Retinal vein occlusion can lead to visual impairments, potential glaucoma, and even blindness, contingent upon the specific vein involved and the swiftness with which the condition can be addressed.