This is a benign condition that causes the pupils to differ in size, usually by up to one millimeter in diameter, without affecting the pupils’ response to light. Simple anisocoriaĪlso called essential anisocoria and physiologic anisocoria, this is the most common type of anisocoria, that has been shown to affect 20 percent of people. There are four main types and causes of anisocoria: 1. In some cases, the pupils may continue to respond normally to light, while in other cases, their responses may differ from one another.Ĭaution: If you notice that your pupils suddenly become unequal in size, seek immediate medical attention as this can be a symptom of a medical condition that requires prompt treatment. What causes unequal pupils?Īnisocoria may be diagnosed if one pupil is bigger or smaller than the other. In most cases, having two different pupil sizes is not a cause for concern - but in some cases, it can indicate a serious problem, requiring emergency medical attention. Occasionally, the two pupils can appear unequal in size. The pupil controls the amount of light that enters the eye by widening and constricting in response to light intensity. The pupil is the black hole in the center of the iris, the part that gives your eye its unique color. Different sized pupils could indicate a serious health issue requiring urgent medical care.
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