A 65-year-old m an su ering from open-angle glaucom a had been receiving several drugs over the past

A 65-year-old m an su ering from open-angle glaucom a had been receiving several drugs over the past 6 m onths, but the control of intraocular pressure proved inadequate. The ophthalm ologist decided to add a drug and prescribed echothiophate. Which of the follow ing actions m ost likely m ediated the therapeutic e ect of echothiophate in the patient’s disease? a. Contraction of the radial m uscle of the iris b. Contraction of the sphincter of the iris c. Decreased production of aqueous hum or d. Dilation of the episcleral venous plexus e. Dilation of retinal vessels f. Contraction of the ciliary m uscle

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