Voissius ring is seen in the-
*Vossius ring is a circular ring of brown pigment seen on the anterior capsule of the lens. It occurs due to striking of the contracted pupillary margin against the crystalline lens. It is always smaller than the size of pupil. Ref: Khurana 7th/e p.447
Cornea
Anterior capsule of the lens
Posterior capsule of the lens
Iris
Diseases of orbit, Lids and lacrimal apparatus