Question

miotic drug therapy for the treatment of glaucoma is based chiefly upon which physiologic action?
enhancing aqueous humor outflow.
inhibiting aqueous humor production.
maintaining intraocular pressure.
preventing extraocular infection.

Explanation:

Miotic drugs (like cholinergic agonists) for glaucoma work by causing miosis (pupil constriction), which opens the trabecular meshwork, thus enhancing the outflow of aqueous humor to reduce intraocular pressure. Inhibiting aqueous humor production is the mechanism of drugs like beta - blockers, not miotics. Maintaining intraocular pressure is not the goal (glaucoma has elevated IOP, so we aim to reduce it), and preventing extraocular infection is not related to miotic drug action for glaucoma.

Answer:

A. Enhancing aqueous humor outflow.