Salus's sign is a clinical sign

Medical sign

A medical sign is an objective indication of some medical fact or characteristic that may be detected by a physician during a physical examination of a patient....

 in which deflection of retinal venule

Venule

A venule is a very small blood vessel in the microcirculation that allows deoxygenated blood to return from the capillary beds to the larger blood vessels called veins. Venules range from 8 to 100μm in diameter and are formed when capillaries unite .Venules are blood vessels that drain blood...

s can be seen on fundoscopy occurring in patients with hypertensive retinopathy

Hypertensive retinopathy

Hypertensive retinopathy is damage to the retina due to high blood pressure .-Pathophysiology:The retina is one of the "target organs" that are damaged by sustained hypertension....

. Arteriosclerosis

Arteriosclerosis

Arteriosclerosis refers to a stiffening of arteries.Arteriosclerosis is a general term describing any hardening of medium or large arteries It should not be confused with "arteriolosclerosis" or "atherosclerosis".Also known by the name "myoconditis" which is...

 causes shortening or lengthening of arteriole

Arteriole

An arteriole is a small diameter blood vessel in the microcirculation that extends and branches out from an artery and leads to capillaries.Arterioles have muscular walls and are the primary site of vascular resistance...

s, which causes venules to be moved at points where arterioles and venules cross over. This is seen at right-angle crossing points, where the venule crosses the arteriole in a horseshoe shape.

The sign is named after Robert Salus

Robert Salus

Robert Salus was an Austrian ophthalmologist remembered for describing Salus's sign. He studied at the German University in Prague, gaining his M.D. in 1902. He was habilitated in ophthalmology in 1909 and became professor of ophthalmology in Prague in 1916...

.