I remember having that when I was very tired. Have you been getting enough sleep?
Umm last night i was up pretty late, but then again i had the problem yesterday aswell :/ But i think i might get an early night to night incase your right.
if you are going for a swim by any chance in the sea... open your eyes underwater.. because salty water cleans your eyes.. and try staying away from your computer for a while
I spend 8 hours staring a computer screen in work haha.. any idea how to reduce the aching. ? and no wearing sunglasses in work isnt an option :P
I get this whenever I overcook it on the computer.
Just remember the 20/20/20 rule. Look at something 20 feet away (or shut your eyes and move them around - or do eye excercises - lots of good ones on Google), for 20 seconds, every 20 minutes. It doesnt hurt to get up every hour and have a drink of water and a stretch too - it may seem like a waste of time but towards the end of the day you'll feel healthier and more productive.
Not to mention - the eye ache is your eyes saying "this is too much"
If it still doesnt get better after trying this - see your optician.