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Many things: This could be physiologic, meaning it's benign and just the way the pupil is. This could be from getting a drug in the eye, a neurologic condition, test inflammation in the eye, and rarely brain aneurysms, brain tumor, cancer, and past inflammation, infection or ischemia in the optic nerve. If this is new you should go to your doctor. ...Read more
See your doctor: Usually people do not experience this. You should see an ophthalmologist. ...Read more
I have just notice that one of my eye pupils is bigger than the other. Are there any ideas on what's causing this?
Anisocoria: Difference in pupillary size (anisocoria) can be completely normal or be a sign of an underlying medical condition. About 20% of the population has normal physiologic anisocoria. If you have absolutely no other symptoms it is likely benign. However, you should probably see your ophthalmologist for a complete exam, ...Read more
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