A Weiss Ring is formed when the posterior hyaloid detaches from which structure?

A Weiss Ring is formed when the posterior hyaloid detaches from which structure?

• A. Optic disc
• B. Macula
• C. Vitreous base
• D. Lens

Answer: (A)

The key idea is that a Weiss ring forms when the posterior hyaloid detaches from the optic disc during a posterior vitreous detachment. The posterior hyaloid cortex pulls away from the retina but remains anchored at the optic nerve head, so as the rest of the vitreous detaches, a circular rim of hyaloid remains around the disc. This residual ring becomes visible as a circular opacity in the vitreous—the Weiss ring. Why the optic disc makes sense here: the optic nerve head is a major site of firm vitreoretinal adhesion, so it commonly serves as the last point of attachment during detachment, leaving that distinct ring behind. The macula, the vitreous base, or the lens aren’t the structures that produce this characteristic ring when the posterior hyaloid detaches.

The key idea is that a Weiss ring forms when the posterior hyaloid detaches from the optic disc during a posterior vitreous detachment. The posterior hyaloid cortex pulls away from the retina but remains anchored at the optic nerve head, so as the rest of the vitreous detaches, a circular rim of hyaloid remains around the disc. This residual ring becomes visible as a circular opacity in the vitreous—the Weiss ring.

Why the optic disc makes sense here: the optic nerve head is a major site of firm vitreoretinal adhesion, so it commonly serves as the last point of attachment during detachment, leaving that distinct ring behind. The macula, the vitreous base, or the lens aren’t the structures that produce this characteristic ring when the posterior hyaloid detaches.