Color vision deficiency (also called color blindness) is a vision disorder in which a person…
The central retinal vein carries oxygen-depleted blood away from the retina (the light-sensitive membrane lining the back of the eye). In rare cases, usually in middle-aged or older people, the central retinal vein or one of its branches becomes blocked by a thrombus (blood clot), which causes blood to leak from the blocked vessel, blurring vision.
Retinal vein occlusion may occur in chronic glaucoma or with high blood pressure. In rare cases, the disorder results from blood diseases in which the blood is thicker than normal and tends to clot more easily. Effective treatment of an underlying disease or condition, such as high blood pressure, can help prevent retinal vein occlusion.
In some cases, an ophthalmologist may recommend laser surgery (which uses a highly concentrated beam of light) to help close leaking blood vessels.