I didn't know you wore glasses Eclair.
Apparently I should have always worn glasses. My eyes have to work very hard to focus on anything apparently, which I never knew. I found this out about 4 years ago, and the optometrist was amazed that I'd gone through life with no headaches and even made it through school...especially liking reading and art. So, when I got glasses, he didn't give me the actual prescription strength I needed because he wanted me to still work and exercise my eyes as long as possible and not wear them all the time, only for reading.
But now, I simply must have them for computer, reading now and I suspect driving, but have fought wearing them driving, to keep exercising the muscles. Whereas 4 years ago, I didn't, or at least my eyes worked well enough to cope. Unfortunately I read a lot, a hell of a lot for work, and I know my sight is deteriorating fast now.