![]() In this type of anisocoria, the unequal pupil sizes occur as a side effect of medication. 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. Simple anisocoria is the most common type, and is generally not a cause for concern. 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. If you have unequal pupils, you could be suffering from anisocoria.
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