When you are staring at a computer for long periods of time you blink less often. This can lead to eye fatigue. To combat it, remember the phrase 20-20-20. This means Every twenty minutes give your eyes a break by looking into the distance twenty feet away, for twenty seconds. It will refresh your eyes and prevent eye strain.
As you get older, it is natural for your eyes to dry out more often. Adding omega-3 to your diet can really help. Another common reason for dry eyes is excessive air flow. Make sure that the vents in your car are not directly on your face.