Miotics are eye drops that cause the pupil to constrict, allowing the blocked drainage angle to open. They may be used two, three, or four times daily. These medications are now reserved for use in people whose glaucoma does not improve with other medications. Miotics may cause some eye discomfort and redness.

Why do miotics treat glaucoma?

Miotics (drugs that cause the pupil to contract) improve the outflow of aqueous as part of the treatment of glaucoma and reduce the risk of a posteriorly luxated lens entering the anterior chamber. The importance of miotics in veterinary ophthalmology has decreased substantially over the last few years.

How do Miotic drugs work?

Miotics work by contraction of the ciliary muscle, tightening the trabecular meshwork and allowing increased outflow of aqueous through traditional pathways. Miosis results from action of these drugs on the pupillary sphincter. Adverse effects include brow ache, induced myopia, and decreased vision in low light.