A healthy 21-year-old man presents to a primary care physician to establish care. On examination the following finding is appreciated as shown in the provided picture. He reports a “drooping” of his left eye since birth according to his parents. The remainder of the physical including neurological examination is normal. What is the likely cause of this patient’s finding? Congenital ptosis. Senile ptosis. Acquired ptosis. Myasthenia gravis. Multiple sclerosis.