What distinguishes open-angle from angle-closure glaucoma in terms of onset and risk factors?

What distinguishes open-angle from angle-closure glaucoma in terms of onset and risk factors?

• A. Open-angle: acute, due to narrow anterior chamber angle; angle-closure: gradual, age-related.
• B. Open-angle: gradual, usually age-related; angle remains open; risk factors include family history and myopia.
• C. Open-angle: goes away with age; angle-closure: never occurs.
• D. Open-angle: only in children; angle-closure: only in elderly.

Answer: (B)