My main concern is that it's being caused by something I'm doing or not doing. Partly it's because I'm 24 and I don't know anyone who's suddenly needed glasses at this age, but also because I could be looking after myself better. I get plenty of exercise, but could improve my diet and do spend a lot of time reading and using the computer.
When it comes to glasses I worry they'll make it worse in the long run like they have with some friends.
Guess it's time to book an appointment with the doctor.
*waves vaguely* Doctor yes.
From what I've picked up re: Making things worse and diet and whatnot, it's bloody close to impossible in modern times -- yes, even if your diet is basically horrible and you spend a lot of time on the computer*. If your eyes are getting worse, there's not actually much you could have done about it. You won the genetic lottery, and that's basically that (barring the occasional edge case, but edge case is edge.). Majority of stuff saying otherwise is modern snake oil, plain and simple.
Friends thinking glasses made things worse in the long run is frank bullshit. It would have got worse anyway, and glasses didn't have a thing to do with it. Would have happened if they wore contacts, would have happened if they wore glasses, and would have happened
and been accompanied by a great deal of inconvenience and regular headaches if they had no vision correcting tools at all.
E: Hrm. Though sorry if some of that came off as somewhat aggressive. I don't exactly mean to demean your friends or anything. They're mostly just making a correlation/causation mistake. S'just misinformation is somewhat annoying, especially on a topic like this. I've gotten a fair amount of flak over the years due to strongly preferring lower-light conditions (i.e. "open the blinds and leave the lights off" kinda' stuff. Half the people in this state are apparently light blind or
something.), so the subject's a little soapbox-y for me.
* Vision damage due to lighting conditions basically takes single-
candle -- as in actual one-tiny-wick candle, not some odd measurement scale -- illumination for hours a day, for
years, before anything meaningful happens.
And trying to read stuff like 1800s and earlier writing. You're not going to see that these days. Even a computer screen alone gives better quality of light.