Parts of the brain that help us feel and decode emotion as well as mentally focus can make pupils widen. Horner’s syndrome can also occur if you’ve had an injury to the carotid arteries (blood vessels in the neck that carry blood and oxygen to the face and brain) or the jugular vein (vein in the neck that carries blood from the brain and face back to the heart). That injury can cause pupils to become smaller. Horner’s syndrome is a condition that occurs when nerve pathways that run from the brain to the face become injured. According to research in the Emergency Medicine Journal, the pupil is typically smaller than normal. Since the iris controls the pupil, it’s not common to see abnormally shaped pupils in cases of iritis. This is an inflammation of the iris of the eye that can be caused by infection, trauma, and autoimmune diseases (diseases in which your body attacks its own immune system). ![]() As the name implies, it occurs in clusters (sometimes as many as eight headaches a day), and can then disappear for weeks or months at a time.īecause this type of headache affects nerves in the face, the pupil on the affected side can become abnormally small (called miosis) during the headaches. This is an intensely painful headache that usually affects one side of the face, directly behind the eye. While it can be a natural occurrence, affecting about 20 percent of people, it can also signal a nerve problem or infection. AnisocoriaĪnisocoria is a condition in which one pupil is wider than other. In some cases, one pupil may be bigger and the other smaller (asymmetrical). One symptom is bigger-than-normal pupils. Problems that affect the optic nerve include glaucoma, optic neuritis, and stroke.Health conditions, injuries, and diseases ConcussionĪ concussion is a brain injury that results from the brain smacking against the hard skull during a fall, a hit to the head, or a fast impact involving the whole body. Optic nerve problems: Your optic nerve carries sensory information from your retina to your brain.This occurs because of a faulty connection between nerve pathways connecting the brain and face. Horner's syndrome: This condition causes a small pupil and a drooping eyelid on one side.Glaucoma: Affecting more than 3 million people in the United States, glaucoma could cause pupils that are not the same size, and it could affect the way pupils respond to light.Eye trauma: Eye trauma can cause several changes to your eye, including a pupil that is not its usual shape. ![]()
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