Kame No Tabi (A Turtle's Travels)

Like emerald_7, I work with an optometerist as well. She pretty much said what I would have suggested. I'll just add that being on the computer a lot can increase dryness since you don't blink as often as you should. That dryness can play a role in straining the eyes. Try some rewetting drops to help keep your eyes hydrated. And, I second emerald_7 in that you should be sure to tell your optometrist about the headaches; glasses for just computer work may help even if your vision seems fine. :)