If eye damage results from trauma, doctors sometimes refer to it as a “blown pupil.” Illicit Drug Use The result of these injuries is that only one eye is affected. Brain Injuriesīrain injuries can be the result of several events, such as a stroke, a tumor or blunt trauma. This damage can occur in one or both eyes, leading to mydriasis and vision impairment. As such, they may lose control of the pupil, leading to dilated pupils.Ī cranial nerve neuropathy indicates gradual damage to the eye nerves. If your eyes are injured through trauma, nerves that control the pupils and iris may get damaged. The release of oxytocin increases during intimate interactions and heightened emotional connections. It increases contraction of a woman’s uterus during labor.īut dilation from oxytocin is mild and temporary. Through the pituitary gland, the body releases oxytocin. Research shows that high levels of the hormone oxytocin can lead to dilated pupils. Medications that treat Parkinson’s disease, nausea and seizures are included, as are botulinum toxin and atropine. They block the transmission of certain chemicals to the eyes, resulting in the pupils to become more dilated.Īmong the groups of medications that cause dilated pupils include antidepressants and antihistamines. Most of them are:Īnticholinergics are substances mostly found in prescription medications. Causesĭilated pupils can come from any number of medication-related or environmental-related causes. A dilated pupil may indicate a medical condition. It remains the same size, which appears bigger than the colorful part (iris) of the eye. A problem occurs when your pupil doesn’t respond to changes in light intensity. And in dim light, it should be 4 to 8 millimeters. In bright light, the size of the pupil should be 2 to 4 millimeters. And narrower in brighter places to minimize light intake. Similarly, it becomes wider in darker places to allow more light into the eye. Usually, the pupil enlarges when you focus on a close object and reduces when you focus on a distant object. Mydriasis arises when the central black part of the eye (pupil) becomes abnormally large. Most cases of dilated pupils resolve in two to 24 hours. The most common are side effects from prescription medications and the use of mydriatic eye drops by eye doctors preparing for a full eye examination.Ī rush of adrenaline, use of some illicit drugs and a surge of the hormone oxytocin can also cause enlarged pupils. Dilated pupils, a condition called mydriasis, can be the result several interactions.
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