How are open-angle glaucoma and angle-closure glaucoma distinguished in terms of angle status and onset?

How are open-angle glaucoma and angle-closure glaucoma distinguished in terms of angle status and onset?

• A. Open-angle glaucoma has a wide, open angle with gradual, usually asymptomatic optic neuropathy; angle-closure glaucoma has a narrow or closed angle often with acute symptoms like eye pain, redness, and a sudden rise in intraocular pressure
• B. Open-angle glaucoma has a narrow angle with acute symptoms; angle-closure glaucoma has a wide angle and gradual neuropathy
• C. Both have abrupt symptoms with similar angles
• D. There is no difference in angle status or onset between them

Answer: (A)