In fact, eye doctors use drops for the opposite effect, to widen pupils, so that they may get a better look inside the eye to detect any abnormalities. Medicated eye drops are not usually in this group. Similarly, narcotics can also cause miosis. Examples of these medicines include diazepam and antihistamines. It can happen in one or both eyes, with accompanying symptoms such as:Ĭertain types of medications, like those that treat muscle spasms, anxiety and seizures, cause the shrinking of the pupils. Inflammation mostly happens in younger and middle-aged people. Research has linked eye inflammation with other conditions such as HIV, tuberculosis, rheumatic disease, lung disease, shingles and gastrointestinal disease. Healthy people can develop eye inflammation, but when it presents it can indicate a larger issue. Uveitis is a condition that causes swelling in the iris and the tissues surrounding it. Injuries to the eye or other maladies that cause swelling will stop the pupil from widening when it needs to. The older a person gets, the smaller their pupils become because of weakening dilator muscles in the iris. A newborn’s pupils stay small for up to two weeks after birth. AgeĪge-related miosis is common in newborns and in older adults. The leading causes of miosis include age, inflammation, medication, cluster headaches, head injuries, neurosyphilis and a family history of the condition. When a pupil stays shrunken even when not in bright light, a condition of miosis, that indicates an underlying problem.ĭoctors consider pupils abnormal if they do not dilate in the dark and if they do not constrict in brightly lit conditions. The pupil shrinks in bright light to protect the eye from excess light from entering the eye. In most cases, the pupils of both eyes are the same size, regardless of the amount of light. Normal pupil size in adults ranges from 2 to 4 mm in bright light and from 4 to 8 mm in dark conditions. Under normal circumstances, the pupil changes size between 2 to 8 mm throughout the day, depending on lighting conditions. Miosis is an eye condition in which the pupils are routinely too small for the lighting conditions. Small pupils let in less light to the eye, making it more difficult for someone to see clearly.Īge, injuries and inflammation to the eyes, some medications and a family history cause most of the cases of miosis.Īny consistent presenting of miosis is cause to see a doctor because it could be a symptom of another underlying condition that is more serious. Miosis is a condition in which the pupils of the eyes are always too small, whether in light or dark.
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