Hello, watching the film "Shutter Island" I've come across this. A man is getting sick, having a migraine. He isphotosensitive (this part of the movie is very bright), and then another man says: Photosensitivity, headaches sometimes. Marshal, are you having a migraine?... Take these, Marshal. Couple of hours, you'll be as clear as a bell. What is the meaning of 'clear' here? Is it reffered to his vision or maybe is it more related to this meaning: Discerning or perceiving easily; keen: a clear mind? What do you think? Thank you!!