So many reasons can cause dry eyes, even dry air, winding or other environmental conditions can cause dry eyes. Others such as menopause, disease which affect tear film can also lead to dry eyes. As far as I am concerned, using too much computer or other electronic products will also have this problem. If your condition is not serious, I suggest you try artifical tear drops. And buy a humidifier, which can make air around you more moist. And have a rest every one hour to relax your eyes. If your condition is serious, you may take a surgery.