Based on Scenario 4: Recall that muscarinic acetylcholine (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, causing the pupils to dilate.
Question: Why does a person experience blurry vision while waiting for the effects of this medicine to wear off?
The lens regulates the amount of light that enters the eye. It dilates in the presence of light and constricts in the dark. Under the effects of this medication the pupil cannot dilate. Therefore, if you go outside or into a well-lit room, the pupil cannot respond correctly and not enough light is allowed to enter.
The pupil regulates the amount of light that enters the eye. It constricts in the presence of light and dilates in the dark. Under the effects of this medication the pupil cannot constrict. Therefore, if you go outside or into a well-lit room, the pupil cannot respond correctly and too much light is allowed to enter.
The pupil regulates the amount of light that enters the eye. It dilates in the presence of light and constricts in the dark. Under the effects of this medication the pupil cannot dilate. Therefore, if you go outside or into a well-lit room, the pupil cannot respond correctly and not enough light is allowed to enter.
The lacrimal system affects the amount of light that enters the eye. It increases tear production in the presence of light and decreases production in the dark. Under the effects of this medication the lacrimal gland cannot produce enough tears. Therefore, if you go outside or into a well-lit room, the lacrimal gland is not producing enough lubrication for the eye to function correctly.
