Horner's syndrome is a rare disorder that can affect anyone, regardless of sex, age, ethnicity, or region. The condition has two forms, the most common of which occurs when something interferes with the nerve pathways to the eyes and face. Horner's syndrome can be a sign of a serious underlying health condition. It can also be genetic and present at birth, but this is extremely rare.
There are four classic signs of Horner's syndrome, three of which relate to the eyes. People with Horner's syndrome have a constricted pupil or miosis. They also experience drooping of the upper eyelid or ptosis and enophthalmos, which is when the eyeball sinks into the eye socket. The fourth sign is anhidrosis, the absence of sweating on the face. These symptoms all occur on the same side of the face as the underlying problem.
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