AV nicking

The Gunn characters (also: crossing phenomenon ) is a term used in ophthalmology. It describes a by disturbances in the blood circulation ( arteriosclerosis, high blood pressure, etc. ) induced retinal damage with changes in the fundus, often in patients with retinitis hypertonica or diabetic retinopathy. This small veins in the retina ( retina) of intersecting arteries are compressed.