![]() ![]() If you take opioids, you might also experience: Accompanying symptoms may offer a clue about what’s causing the problem. Pinpoint pupils are a symptom, not a disease. certain medications, such as clonidine for blood pressure, lomotil for diarrhea, and phenothiazines for certain psychiatric conditions like schizophrenia.Certain prescription eye drops, such as pilocarpine, carbachol, echothiophate, demecarium, and epinephrine, can also cause pinpoint pupils.Insecticides can also cause pinpoint pupils. Exposure to chemical nerve agents such as sarin, soman, tabun, and VX: These are not naturally occurring substances.Other causes include rheumatoid arthritis, mumps, and rubella. Anterior uveitis, or inflammation of the middle layer of the eye: This may be due to trauma to the eye or the presence of something foreign in the eye.A stroke, a tumor, or spinal cord injury can lead to Horner syndrome. Horner syndrome (Horner-Bernard syndrome or oculosympathetic palsy): This is a group of symptoms caused by a problem in the nerve pathway between the brain and one side of the face.Bleeding from a blood vessel in the brain ( intracerebral hemorrhage): Uncontrolled high blood pressure ( hypertension) is the most common reason for this.Other possible causes of pinpoint pupils include: One of the most likely reasons someone might have pinpoint pupils is the use of narcotic pain medications and other drugs in the opioid family, such as: What are common causes of pinpoint pupils? In the dark, they usually measure between 4 and 8 millimeters. In adults, pupils normally measure between 2 and 4 millimeters in bright light. Some drugs can cause your pupils to get bigger, while others make them get smaller. ![]() For instance, your pupils might get bigger when you’re excited or on heightened alert. Other than lighting, pupils can change size in reaction to other stimuli. When a doctor shines a light into your eyes after an injury or illness, it’s to see if your pupils are reacting normally to light. Pupil constriction and dilation are involuntary reflexes. It’s also the reason your eyes are a bit sensitive after your eye doctor dilates them on a bright day. That’s why there’s an adjustment period when you enter a dark room. That allows more light in, which improves night vision. In the dark, your pupils get bigger (dilate). In bright light, your pupils get smaller (constrict) to limit the amount of light that enters. The pupil is the part of your eye that controls how much light gets in. Another word for it is myosis, or miosis. Pupils that are abnormally small under normal lighting conditions are called pinpoint pupils. ![]()
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