Depending on your symptoms and medical history, your eye doctor might conduct tests, such as eye exams and blood work, to help diagnose the underlying cause of your anisocoria. If you notice a sudden difference in size between your pupils, you should contact your eye doctor immediately. What do I do if I notice that I have unequal pupils? Certain drugs have been identified that could be potential causes of pharmacologic anisocoria, such as anti-depression medication, chemotherapy, patches used to treat motion sickness, or certain glaucoma eye drops. Unequal pupil shape or differences in diameter greater than 1mm are often due to an. In this type of anisocoria, the unequal pupil sizes occur as a side effect of medication. A difference in pupil size can occur normally in about 20 percent of people, but this size difference is typically very small, on the order of one-half millimeter or so. Pupils should be equal, round and equally reactive to light. Some examples of this condition include coloboma, which is a gap in the iris that gives the pupil a distinct cat-eye appearance, or aniridia, which is an eye condition where there is a complete or partial absence of the iris of one eye. Damage to the eye can include eye trauma, complications after or resulting from eye surgery, glaucoma or inflammation of the eye.Ĭongenital anomalies (anomalies present from birth) present in the iris are also classified under mechanical anisocoria. When unequal pupil sizes are caused by damage to the eye, it falls under the category of mechanical anisocoria. This constriction then results in anisocoria. For example, in people with Horner’s syndrome, one of the symptoms is miosis, which is the constriction of one pupil. Pathologic anisocoria is unequal pupils caused by an underlying condition or disease, such as Horner’s syndrome or Third nerve palsy. In fact, simple anisocoria can be intermittent or constant, and may sometimes even go away on its own without any medical intervention. 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 is the most common type, and is generally not a cause for concern. Simple anisocoria (otherwise known as physiologic or essential) is the most frequent cause of uneven pupil sizes. Simple anisocoria, also known as essential anisocoria or physiologic anisocoria, is the term for the condition where the difference in pupil size in both the eyes is less than 1 mm, and both pupils react normally when exposed to light. There are four different types of anisocoria, and each type has different causes and manifestations: 1. 4 different types of anisocoria ( unequal pupils ) and their causes One pupil may be larger than normal, or one pupil may be smaller than normal, therefore resulting in unequal pupil sizes. In most people, they are usually the same size in both eyes.įor people with anisocoria, the pupil sizes in both eyes are different. Pupils, the black circles at the centre of our eyes, are what allows light to enter our eyes so that we can see. The benign condition known as “Adie’s tonic pupil” typically causes one pupil to be noticeably bigger than the other, with the affected pupil not reacting to light.If you have unequal pupils, you could be suffering from anisocoria. We accept payments by cash, checks, and Visa, MasterCard, American Express and Discover credit cards. To schedule an appointment, please call us today. Since no standard pupil size has been established for. Unequal pupil size why professional#But you should have your unequal pupils evaluated by an eye care professional before you assume all is well. For different reports of Zernike expansions, to be compared, the same pupil diameter is required. If the difference in pupil size is minor and your pupils react normally to tests your eye doctor performs, there may be nothing to worry about. These cases warrant examination by the ophthalmologist. On the other hand, more pronounced “significant aniscoria,” in which one pupil is larger than the other by more than 1.0 mm, may be the result of trauma, eye disease (such as “iritis”), or neurological disorders. Some research suggests that about 20 percent of the general population have benign, mild anisocoria. Southern Eye Institute - UNEQUAL PUPILS When one pupil of the eye is noticeably larger (dilated) or smaller (constricted) than the other, the condition is known as “anisocoria.” In most cases of mild anisocoria (known as “simple anisocoria” or “benign anisocoria”) that are not caused by underlying disease or trauma, one pupil is bigger than the other by less than 1.0 mm.
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