I saw my doctor for the second time for a follow-up after an x-ray and this is a man that I adore. He left the room to get a report. When he came back I couldn't see anything. I could only hear his voice. He asked me a question which I could not answer properly because I couldn't see the expression in his eyes in order to interpret what he meant by "Is that it?" which he repeated twice. I think this doctor is as fond of me as I am of him. As soon as he left I could see again. What is the cause of this short-term loss of vision and is there a medical term for it?