Miotic Ophthalmic Preparations Used to Treat Glaucoma Cause Iris Sphincter

question 14

Multiple Choice

Miotic ophthalmic preparations used to treat glaucoma cause iris sphincter muscle contraction,resulting in constriction of the pupil.By what mechanism does this decrease IOP?

• A)As the pupil constricts,the trabecular meshwork opens the canal of Schlemm,increasing the outflow of aqueous humor.
• B)As the pupil dilates,the trabecular meshwork relaxes and opens the canal of Schlemm,increasing the outflow of aqueous humor.
• C)An increase in aqueous humor causes increased pressure on the canal of Schlemm.Acting as a pressure release valve,the canal opens,increasing the outflow of aqueous humor.
• D)Nerve endings in the cornea are triggered by an increase of aqueous humor and intraocular pressure.This stimulation causes the canal of Schlemm to close,shutting off a negative feedback mechanism,increasing the outflow of aqueous humor.

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