When I was in Stockholm a few weeks ago, I noticed that I had trouble focusing on glowing objects at a distance. When I got back, the phenomenon didn't go away, so I went to see the optometrist. As it turns out, I've most likely been hyperopic all my life, without noticing because it's been a small enough defect not to bother me. Lately, with me working too much, though, and the defect has come to the surface. Hence the glasses, for when I read. Just to give the poor muscles of my eye time to relax.