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.
Nonproliferative Diabetic Retinopathy (NPDR) and Macular Edema. Normal retinal blood vessels are watertight and do not leak. In diabetes, the retinal blood vessels can become damaged and develop tiny leaks. This is called nonproliferative diabetic retinopathy (NPDR). Blood and fluid seep from the leaks in the damaged retinal blood vessels, and fatty material (called exudate) can deposit in the retina. This causes swelling of the retina.