It’s normal for a newborn to have small pupils for up to two weeks.Īs you get older, your pupils tend to grow smaller. organophosphates, found in many insecticides, herbicides, and nerve agentsīoth newborns and older adults may have small pupils.phenothiazine-type antipsychotics used to treat schizophrenia, including prochlorperazine (Compazine, Compro), chlorpromazine (Promapar, Thorazine), and fluphenazine (Permitil, Prolixin).second-generation or atypical antipsychotics, including risperidone, haloperidol, and olanzapine.cholinergic drugs used to stimulate the parasympathetic nervous system, including acetylcholine, carbachol, and methacholine.clonidine, which is used to treat high blood pressure, ADHD, drug withdrawal, and menopausal hot flashes.pilocarpine eye drops used to treat glaucoma.tobacco products and other nicotine-containing substances.Other drugs and chemicals that can cause miosis include: Some of the commonly used drugs and chemicals that can cause miosis are opioids, including: loss of the lens of the eye (aphakis) due to surgery or accidentĭrugs and chemicals that can cause miosis.iris inflammation (iridocyclitis, uveitis).intracranial hemorrhage and brain stem stroke.Diseases or conditions that can cause miosisĭiseases or conditions that can cause miosis include: To reach your eye, these nerves pass along your third cranial nerve, also called the oculomotor nerve.Īny disease, drug, or chemical agent that affects these nerves, or the parts of the brain and head that they pass through, can cause miosis. They’re part of the parasympathetic or involuntary nervous system. The iris sphincter muscles are controlled by nerves that originate near the center of your brain. Usually miosis or pupil contraction is caused by a problem with your iris sphincter muscles or the nerves that control them.
The size of your pupil is controlled by two counteracting muscles - the iris dilator and the iris sphincter.
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