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Visit your doctor if you notice changes in your pupil size that are unrelated to light and viewing distance or if you’re having any changes or problems with your vision. Researchers have found that when we have to think very hard because a task is difficult or new to us, our pupils dilate - and the harder the task, the more they dilate.This is called “ pupil contagion” and is most likely to occur when you look at someone you trust or who’s known to you. When you look at others with dilated pupils, your pupils tend to dilate as well.One small 2003 study showed that when people listened to emotionally charged sounds (a baby laughing or crying) versus sounds that were considered neutral (routine office noise), their pupils became bigger.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. 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.