Horner's syndrome (also called oculosympathetic paresis, or Horner syndrome) comprises a constellation of clinical signs including the classic triad of ptosis, miosis, and anhidrosis. It results from a lesion to the sympathetic pathway that supply the head and neck region. By: https://www.instagram.com/p/CapMOzNBQ3h/?igshid=YmMyMTA2M2Y=