Er, coffee?
Sorry, I guess that's not quite what you mean.
I spend long days at a computer, and it's more of a problem if I wear
contact lenses (yes, I wear Focus Dailies) than
glasses. That's a shame, because as a rule my vision is clearer with contact lenses, and I'd rather not wear glasses anyway.
The problem is that we tend to stare at computer screens, not blinking often enough, so our eyes dry out more and get more strained. I find ten hours or so in contact lenses is quite enough, but six or seven hours at a computer can leave me dying to take my lenses out.
There's lots of advice around about caring for your eyes (and the rest of you) while working at a computer. Most of it says rest your eyes from time to time by looking at other things, at different distances away, to give your eyes a bit of variety. It's good to get up and move around every so often, too, and this also rests your eyes.
What works for me is to get up and go and fetch a drink (yes, sometimes coffee) every hour or so, and to allow myself to chat with my colleagues from time to time. These activities automatically mean my eyes are getting abit of a rest from looking at the monitor all the time. And after I've had one or two coffees, I need to take more breaks to visit the bathroom, which also gives my eyes a rest...
In fact, I often wrestle with a difficult bit of database programming or something for an hour, then, when I get up to do something, suddenly realise the answer is quite simple. That bit of physical activity is great for the brain as well as for your eyes!
Some people find re-wetting drops help. I tried that, and it doesn't really work for me.
My optician gave me a trial pack of Focus Dailies All-day Comfort, to see if that helped. If they were better than the regular Dailies, the difference was very slight, for me. It might be worth a try, though, especially if you can get a free trial pack from your eye quack.