What do anticholinergics do in relation to the pupil?

Anticholinergics are a class of medications that block the action of the neurotransmitter acetylcholine in the body. When it comes to their effect on the eyes, anticholinergics lead to the dilation of the pupil, a process known as mydriasis. This occurs because these medications inhibit the sphincter muscle of the iris, which is responsible for constricting the pupil. As a result, the pupil expands, allowing more light to enter the eye, which is useful in various medical situations, such as during an eye examination or to treat certain eye conditions.

Dilation creates a larger opening in the pupil, which is particularly important in situations where thorough examination of the retina is needed or in conditions like uveitis, where reducing inflammation is desired. Understanding the action of anticholinergics helps in anticipating their effects on vision and in managing their therapeutic use effectively.