Adie's pupil is an uncommon neurological disorder, affecting only about one in every 50,000 people. It typically results in one pupil (the Adie's pupil) being larger and slower to respond to light than the other pupil. It can be caused by a variety of factors, including trauma, viral infections, and certain medications. Symptoms of Adie's pupil include blurry vision, difficulty focusing, and light sensitivity. Treatment typically involves using eye drops to constrict the affected pupil and improve vision. In some cases, surgery may be recommended. Adie's pupil can be a chronic condition, but most people recover without any long-term effects.