The air quality in the environment that you use a computer in can play a role in eyestrain and dryness. Use a humidifier to increase the amount of moisture in the air. If necessary, move away from fans and vents that blow air toward your eyes and face.
Also, avoid smoking or being exposed to secondhand smoke that can irritate your eyes.
Some supplements may help improve your dry eye and eyestrain symptoms. For example, omega-3 fatty acids and bilberry extract may help with dry eye, but research is limited.
Always talk with your optometrist or ophthalmologist before taking any supplements.