Certified Emergency Nurse (CEN) Practice Test 2025 - Free CEN Practice Questions and Study Guide

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What effect does a mydriatic agent have on the pupil?

Constriction

Dilation

A mydriatic agent is specifically designed to cause dilation of the pupil, a process known as mydriasis. These agents work by either stimulating the muscles that dilate the pupil or by inhibiting the muscles responsible for constricting it. This dilation can be useful in various medical settings, particularly during eye examinations, where a wider pupil allows for better visualization of the internal structures of the eye, such as the retina and optic nerve.

In contrast, options like constriction represent the action of miotic agents, which do the opposite by making the pupil smaller. Paralysis refers to the loss of function or movement in a muscle, which does not directly apply to the specific action of mydriatic agents on the pupil. Locking is not a recognized term in relation to the physiological responses of pupils. Therefore, dilation is the correct description of the effect mydriatic agents have on the pupil.

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Paralysis

Locking

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