What effect do miotics have on the pupil?

Miotics are a class of medications specifically designed to constrict the pupil. They achieve this effect by stimulating the iris sphincter muscle, which is responsible for narrowing the pupil's diameter. This action is counter to that of mydriatics, which dilate the pupil.

The constriction of the pupil can be beneficial in certain medical conditions, such as glaucoma, where reducing pupil size can help increase the outflow of aqueous humor, thereby lowering intraocular pressure. The pharmacological mechanism typically involves cholinergic agents that act on the muscarinic receptors of the eye, promoting this pupillary constriction.

In summary, the action of miotics is pivotal in several ocular treatments, particularly for managing conditions characterized by increased eye pressure.