![]() ![]() There are several disorders that cause anisocoria. These are almost always noticed in childhood. These defects include aniridia (absent iris), coloboma (partial absence of the iris), and ectopic pupil. Some birth defects of the iris can cause the pupil to have an irregular, fixed shape. If your pupils have been unequal for a long time and you have no other vision problems, you don't need to worry. This is known as physiological or essential anisocoria and does not affect vision. The pupils react to changes in illumination as expected but remain of different sizes. Anisocoria CausesĪbout 20% of people have pupils of unequal sizes. But anisocoria can also be a sign of severe diseases of the brain, nervous system, or other body systems. Anisocoria caused by medicines or recreational drugs will resolve when the drug is stopped. Some people have anisocoria from birth, which causes no trouble. In low light, the other pupil will dilate, causing anisocoria. Similarly, some disorders cause one pupil to be constantly small. When the other pupil contracts in response to strong light, the pupil in the affected eye remains large. If the iris muscle is paralyzed, the pupil will be dilated. Unequal pupils happen when one pupil is not reacting to light as it should. ![]() Usually, your pupils dilate and constrict together and are the same size as each other. When there is intense light, the pupils constrict (become smaller). The pupils dilate (widen) when illumination levels are low to let more light into the eye. What Is Anisocoria?Īnisocoria is a condition in which your two pupils appear unequal in size. Anisocoria might be a sign of a severe eye or nervous system disorder. If you notice your pupils are unequal, you should talk to your doctor. Your pupils are usually the same size as each other, dilating and constricting together as the light level decreases and increases.Īnisocoria is a condition in which the two pupils of the eye are unequal in size. It has a circular opening called the pupil that changes size in response to the light level. The iris is a structure behind the transparent cornea of the eye. ![]()
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