Maybe there is something in your eyes, but as you can make sure that they are clean, we can get some other assumptions.
First, I wonder if you have a bang ahead of your forehead. Because the hair around your eyes may sometimes get into your eyes and cause your eyes feel chronicly uncomfortable. So what you need is a hair cut.
Secondly, it may be a sign of dry eyes. You have to pay more attention to protect your eyes. You should have a timely rest when you are using computer, you can just see through your windows something faraway. Proper exercises outdoors may help after sitting for a long time, which because exercises can improve the condition of blood provision to fast the metabolize. Eye drops can also relief it. A healthy diet is also necessary.
If things do not get better, you'd better see your doctor.