The various types of MRI scans that are used â most commonly the T1-weighted scan and the T2-weighted scan â measure this relaxation time in different ways. Computer programs translate these data into cross-sectional pictures of the water in human tissue.
What is Hypertensive Retinopathy? Hypertensive retinopathy is damage to the retina from high blood pressure. The high blood pressure changes the microvasculature of the layer of tissue at the back part of the eye. Severe damage to the eye is likely if the person has been living with high blood pressure for a long period of time. Common symptoms.
Over time, too much sugar in your blood can lead to the blockage of the tiny blood vessels that nourish the retina, cutting off its blood supply. As a result, the eye attempts to grow new blood vessels. But these new blood vessels don't develop properly and can leak easily. There are two types of diabetic retinopathy: Early diabetic retinopathy. In this more common form â called nonproliferative diabetic retinopathy (NPDR) â new blood vessels aren't growing (proliferating). When you have NPDR, the walls of the blood vessels in your retina weaken. Tiny bulges (microaneurysms) protrude from the vessel walls of the smaller vessels, sometimes leaking fluid and blood into the retina. Larger retinal vessels can begin to dilate and become irregular in diameter, as well.