Vortex veins contain many valves used to drain blood from the choroid.

• A. True
• B. False
• C. Sometimes
• D. Not specified

Answer: (B)

Vortex veins are the main channels that drain the choroid and carry blood from the back of the eye toward the systemic venous system, joining the superior and inferior ophthalmic veins. They are valveless, which allows blood to flow based on changing pressure gradients without being hindered by valves. This design helps keep choroidal drainage efficient even as intraocular and orbital pressures fluctuate. If vortex veins had valves, they'd impede drainage during increases in pressure, potentially leading to venous congestion. Therefore the statement is not correct: vortex veins do not contain many valves. (Some smaller orbital veins may have valves, but the vortex veins themselves are typically valve-free.)