Which structure forms a circular canal at the sclerocorneal junction and drains the aqueous humor into the veins?

• A. Tenon's fascia
• B. Canal of Schlemm
• C. Uvea
• D. Stroma

Answer: (B)

Aqueous humor drainage relies on a circular canal at the limbus that transfers fluid into the venous system. This canal is the Canal of Schlemm, located right at the sclerocorneal junction. Aqueous humor from the anterior chamber passes through the trabecular meshwork into Schlemm's canal, then drains via collector channels into the episcleral veins. Tenon's fascia surrounds the eyeball but isn’t a drainage canal; the uvea is the middle vascular layer of the eye; the stroma is the cornea’s connective tissue. So, the canal described is Schlemm's canal.