Which statement about the scleral spur is accurate?

• A. Protrusion of the sclera into the anterior chamber; marks the posterior border of the trabecular meshwork; site of attachment of the ciliary body
• B. A part of the iris
• C. A tear drainage channel
• D. A posterior segment lesion

Answer: (A)

The scleral spur is a key landmark at the anterior chamber angle. It’s a projection of the sclera that helps define where the aqueous humor outflow pathway lies and provides an anchor for nearby tissues. The statement describes it as protruding into the anterior chamber, marking the posterior border of the trabecular meshwork, and serving as the attachment site for the ciliary body. This combination is exactly what the scleral spur does: it sits at the angle, delineates the back edge of the trabecular meshwork, and provides a point where the ciliary body attaches, helping to stabilize structures around Schlemm’s canal.

Describing it as part of the iris would place it in a different structure entirely. Calling it a tear drainage channel confuses it with the lacrimal drainage system. Labeling it as a posterior segment lesion misplaces it in the back of the eye rather than in the anterior chamber angle.