A 25-year-old man presents to the Emergency Department after being punched in the face during an altercation. He complains of double vision, particularly on upward gaze, and pain around his right eye. On examination, there is periorbital bruising and swelling, subconjunctival haemorrhage, and restricted upward movement of the right eye. Sensation over the right cheek and upper lip is reduced. What is the most likely diagnosis?