I've discovered that I squint when I read. Is that weird? Is it bad?
I've also started compensating for this, so if I notice I'm squinting, I'll start squinting with the OTHER eye instead. I do the same thing with my wallet; I'll wear it in my back left pocket for a week, then I'll switch it to try to even out whatever minor effect it may be having on my spinal alignment.
I hope I'm not ruining my eyes. Or my spine.