![]() He may have gotten into something when you weren't watching. What Is Wrong With My Dog? Pupils Dilated, Raspy Breathing, Can't Walk On Hind Legs, Allergies If there was no nitrogen and we start a fire, it would not stop. Why Is Nitrogen Found More In The Air Than Oxygen? You probably noticed that when you buy shoes and the man measures your feet, one foot is larger than. Other severe causes of anisocoria might include aneurysm, excess pressure within one eye because of glaucoma, bleeding inside the head from a head injury, brain abscess or tumor, infections of the membranes of the brain caused from encephalitis or meningitis, migraines, seizure, or a lymph node, mass or tumor within the upper chest that causes nerve pressure resulting in a smaller pupil. Get immediate medical help if each pupil differs in size after a head or eye injury, or if the difference in the size of each pupil occurs together with double vision, blurred vision, vision loss, severe pain in the eye, fever, headache, vomiting or nausea, stiff neck or when the eyes are extremely sensitive to the light. Always seek the advice of a doctor if there is a sudden, unexplained or persistent change in the size of a pupil. If however, the unequal pupil size develops later on in life and does not return to normal it could be a sign of nerve, blood vessel or brain disease. If other members of the family also have similar pupils, then the difference in pupil size could be genetic and normal. A baby who is born with unequal sized pupils might not have an underlying disorder. Eye drops could also be a harmless cause of a change in the size of a pupil. It is normal for a pupil to have a 1 mm difference in size. Sometimes the pupils may differ temporarily in size, but it is nothing to worry about if the pupils go back to normal and you are not experiencing any other symptoms. The medical term for this is called anisocoria. There are a number of reasons why pupils are unequal in size.
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