Avoid looking at your computer screen for too long. Take a break every half hour to give your eyes a rest from the strain. Staring at your computer can cause dry eye because you do not blink as often, so make an effort to blink every 30 seconds while you are at your computer.
Do you wear contacts? If so, make sure you have a pair of glasses that you can wear if your eyes get irritated. You do not want to make the situation worse by forcing yourself to wear the contacts because serious problems can result. Also, make sure you keep the contacts very clean.