On Friday, an ophthalmologist (M.D.) said I have a swollen optic nerve. He prescribed a field vision test, which I had today, and an MRI, which I am having tomorrow. At the conclusion of the field vision test, he asked me how my appetite had been lately and whether my scalp hurt. I told him my appetite had waned; no noticeable scalp pain. What, in your opinion, was the doctor probing for, and what may he be thinking?