Affecting up to 20% of the population, anisocoria is often entirely harmless, but can be a sign of more serious medical problems.Īnisocoria is a common condition, defined by a difference of 0.4 mm or more between the sizes of the pupils of the eyes. ə, ˌ æ n aɪ-/ Īnisocoria is a condition characterized by an unequal size of the eyes' pupils. It is crucial to protect and pay attention to the changes in your eyes. Doctors can judge the location and nature of the disease based on the size of the pupil and its response to light. The pupil size change has important clinical significance in ophthalmology, internal medicine, neurology, brain surgery, etc. Through the adjustment of pupils, we maintain proper light to enter our eyes and there will be no excessive light to damage the retina. These are small, unequal, misshapen pupils that do not normally react to light. Syphilis: Syphilis can cause an Argyll-Robertson pupil.Head trauma: Head injury or concussion can cause unequal pupils.Brain aneurysm: An aneurysm in the brain can cause a dilated pupil, as well as other symptoms.Third cranial nerve palsy: A complete third eye palsy results in one eyelid completely closed, with the eye bulging outward and downward. In this condition, your pupil stays expanded and shows very slight changes in size.
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