![]() If your miosis is the result of prescription drugs, such as for glaucoma or high blood pressure, your doctor may be able to find a substitute drug that will reduce or eliminate the symptom. It can provide an important clue to your doctor in finding the underlying cause. Miosis is a symptom of something else and not a disease in itself. When the infection affects the third cranial nerve, it can cause miosis and Argyll Robertson pupil. Except for the genital rash, untreated Lyme can produce many of the same symptoms in the nervous system as syphilis. Lyme disease is caused by infection with a corkscrew-shaped bacterium similar to the syphilis spirochete. However, they contract when focusing on a near object. In Argyll Robertson, the pupils are small but don’t contract further when exposed to light. The infection can affect the midbrain and cause a specific type of miosis called Argyll Robertson pupil. Syphilis can invade the nervous system at any stage of the infection. When an untreated syphilis infection progresses to the brain, it’s called neurosyphilis. Iris inflammation can also be called iridocyclitis iritis or uveitis. Decreased pupil size (miosis) can be a symptom of inflammation of your iris, the colored portion of your eye. Horner’s is sometimes the result of a stroke, brain tumor, spinal cord injury, or shingles (herpes zoster) infection. Decreased pupil size (miosis) and drooping eyelid on one side of the face are typical symptoms. Horner’s syndrome is a collection of symptoms resulting from damage to the nerves connecting the brain to the face or eye. It can occasionally produce jerking or shaking that looks like a seizure, slurred speech, or sudden loss of consciousness. The most common symptoms are dizziness, vertigo, and weakness on both sides of the body. ![]() A hemorrhage or stroke happens when the blood supply to your upper brain stem ( Pons) is cut off by a burst artery or a blockage.Ī brain stem stroke does not produce the same symptoms as a typical stroke. Miosis in both pupils is a common symptom of an intracranial hemorrhage or a brain stem (Pontine) stroke. Intracranial hemorrhage and brain stem stroke. Other cluster headache symptoms can include: Miosis is one of the common accompanying symptoms. It occurs only on one side of your head, and recurs at different intervals, depending on the type of cluster headache you have (chronic or episodic). A cluster headache produces very severe pain around or above the eye, in your temple or forehead. Here we’ll break down some of the common causes of miosis and their accompanying symptoms:Ĭluster headaches. This is usually due to weakness of the iris dilator muscles, not to a problem with the iris constrictors.īecause miosis can be triggered by a variety of diseases and conditions, there are many possible accompanying symptoms. 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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