Horner's syndrome: Horner syndrome is a neurological disorder caused

Horner syndrome is a neurological disorder caused by disruption to sympathetic innervation to the eye with ptosis, miosis, and anhidrosis Horner's Syndrome, also known as Horner's syndrome or oculosympathetic palsy, is characterized by a triad of symptoms: ptosis (drooping of the upper eyelid), miosis (constricted pupil), and anhidrosis (lack of sweating) on the affected side of the face. Horner syndrome is a condition that occurs when there is damage or interruption to a pathway of nerves that run from the brain to the face and eyes. This can result in a range of symptoms including a drooping eyelid, a small pupil, and a decreased ability to sweat on the affected side of the face. The underlying causes of Horner's Syndrome vary greatly and may include a tumor, stroke, injury or underlying disease affecting the areas surrounding the sympathetic nerves. In rare cases, Horner's syndrome is congenital (present from birth) and may be associated with a lack of pigmentation of the iris (colored part of the eye).