Health professionals do not know exactly why people develop simple anisocoria. The difference in pupil size will be less than or equal to 1 mm, and the condition may be intermittent, persistent, or self-resolving. This particular type can affect up to 20% of the population. Simple anisocoria (otherwise known as physiologic or essential) is the most frequent cause of uneven pupil sizes. The following list shows different types of anisocoria and their causes. In some cases, anisocoria can develop due to a possibly life-threatening condition. While the condition is common, the causes may or may not be benign. 2 American Association for Pediatric Ophthalmology and Strabismus Types of AnisocoriaĬharacterization of anisocoria includes unequal pupil sizes. The degree of anisocoria can differ each day and even switch eyes. You may require emergency intervention to address the cause of the eye condition.Īpproximately 30% of the average population will have anisocoria. If you have anisocoria and experience accompanying symptoms like headaches or eye pain, you should seek immediate care. However, having uneven pupils can sometimes indicate a serious eye issue or underlying health condition.įor example, people who are at risk of developing anisocoria include those with: Its role is to let light come into the eye so you can see.Īny person can have pupils of different sizes. The pupil is the dark circle that appears in the middle of the eye. If you have anisocoria, it means your pupils are not the same size. ![]() What is Anisocoria (Unequal Pupil Sizes)?
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