A patient receives topical atropine to facilitate an eye examination. The nurse will tell the patient to remain in a darkened room or to wear sunglasses for several hours until the effects of the me-dication wear off
This teaching is based on the nurse's knowledge that muscarinic antagonists cause: a. elevation of intraocular pressure.
b. miosis and ciliary muscle contraction.
c. paralysis of the iris sphincter.
d. relaxation of ciliary muscles.
C
By blocking muscarinic receptors in the eye, atropine causes paralysis of the iris sphincter, which prevents constriction of the pupil; consequently, the eye cannot adapt to bright light. This also causes an elevation in intraocular pressure, which increases the risk of glaucoma. However, it is not an indication for wearing darkened glasses. Muscarinic agonists cause miosis; atropine causes mydriasis. The effect of relaxing ciliary muscles focuses the eye for far vision, causing blurred vision.
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