First reason is the most common reason, that is eyestrain. To solve this problem, regular rest and avoid using eyes for too long. Have a rest every one hour. Supply some antioxidation, such as anthocyanin, fruit, these things can protect retina. Second reason, is contact lens. Unhygienic personal habit will make your eyes effected, so that you may feel pain. As a result, you should pay more attention to personal sanitation, especially do not wear contact lens more than one day. Other reasons like cornea inflammation, pink eye can also make your eyes hurt. What's more, as you know, Tv, computer, mobil phone, and every electronic product have radiation, which will make eyes inch, dried and pain. You can buy computer glasses which can prevent radiation