I have type 2 diabetes. I've been having more difficulty over the last two months reading close-up things. It's nothing drastic but could this be caused by diabetes? Maybe it's just old age or the fact that I spent too much time staring at a screen. Doing too much computer stuff might have caused blurry eyes that I'd have for a while after each session (lights would have a halo around them). Should I book an eye exam?