Horner syndrome does not damage the eye or cause vision loss. There also may be loss of sweating, especially on the forehead on the same side. The pupil on the affected side is abnormally small (miosis) and the upper eyelid will droop (ptosis). Horner syndrome occurs when these nerves do not work. These nerves also control the muscles that open your eyelids and activate the sweat glands on your face. The nerves controlling the muscles that dilate the pupil are part of the sympathetic (“fight or flight”) nervous system. The left pupil is smaller (solid arrow) and the left eyelid is droopy (dashed arrow). Horner Syndrome: An Abnormally Small Pupil Though many causes of anisocoria are benign and some people only notice some blurry vision and/or light sensitivity, it can be a sign of a serious and potentially life-threatening neurological problem. Why should I be concerned about anisocoria?Īnisocoria cannot make you go blind. When this affects one side, the pupil sizes may be unequal. Problems affecting the muscles or nerves controlling the pupil cause abnormal pupil size. In bright light (such as sunlight), the pupil constricts to make the pupils smaller, which decreases the amount of light getting into the eye. Normally, in dim light (such as at night), the pupil dilates (opens) to let in more light to the eyes. While small differences in pupil size are normal and can even come and go ( physiologic anisocoria), constant and significant differences in pupil sizes may be a sign of damage to the nerves that control the pupils or to the brain. Normally our pupils are relatively the same size. What is anisocoria?Īnisocoria is a medical term for unequal pupil size.
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