Vision. Recall that muscarinic ACh receptors are located on smooth muscle tissue. The iris is composed of smooth muscle and is responsible for dilation and constriction of the pupil. Tropicamide is a medication applied to the eye during an eye exam.  If Tropicamide is an antagonist to the muscarinic receptors, what effect will this have on the eye? Why do you have difficulty seeing well while you wait for the effects of this medicine to wear off?

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