The primary mechanism of action of beta-adrenergic blockers in the treatment of open-angle glaucoma is to
1. increase the outflow of aqueous humor.
2. constrict the pupil.
3. dilate the pupil to increase outflow.
4. reduce production of aqueous humor.
Correct Answer: 4
Rationale 1: Prostaglandins increase the outflow of aqueous humor.
Rationale 2: Cholinergic agonists constrict the pupil to allow for more room for outflow.
Rationale 3: Carbonic anhydrase inhibitors dilate the pupil to increase outflow.
Rationale 4: Beta-adrenergic blockers decrease the production of aqueous humor.
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