![]() The syndrome is characterized by anisocoria (pupil smaller on the affected side), mild ptosis. If there is an underlying medical condition, that issue will need to be treated. Lesions anywhere along this pathway may cause Horner syndrome. Usually anisocoria does not need to be treated since it does not affect eyesight or eye health. Based on the evaluation, the doctor may perform additional tests to make a diagnosis. During a complete eye examination by an ophthalmologist, the size of the pupils and how they react to bright and dim light will be checked. How does the doctor determine whether anisocoria is due to an underlying medical problem or physiologic?Ĭertain characteristics, such as when the anisocoria was first noted, whether it is more noticeable in bright or dim light, and whether or not there was an event related to the change will help determine the underlying cause. The difference between the sizes of the two pupils is rarely more than 1-2 mm but may vary from time to time. Physiologic anisocoria can occur in 20% of the population. Depending on the lighting conditions, the pupil will change in size to allow more or less light in the eye.Īnisocoria that is NOT associated with an underlying medical condition is called physiologic anisocoria. ![]() The hole in the middle of the iris, which allows light to enter the eye, is called the pupil. This iris is a circular muscle, similar in shape to a donut. The colored part of the eye is called the iris. The condition usually does not affect eyesight or eye health. The presence of anisocoria can be normal (physiologic), or it can be a sign of an underlying medical condition. Etiologies of this clinical manifestation usually include systemic causes as neurological. In many people, the size of the pupils is the same in each eye, and both pupils will become smaller or bigger to let light in at the same time. Anisocoria indicates a difference in pupil diameter. Anisocoria is a term which refers to the pupils being different sizes.
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