Eye stretching exercises. Focus on something as close as possible (in good light) then slowly track out to something at infinite distance, one eye then the other then both.
Additionally, make sure the contrast on the screen matches your surriundings! There's no reason to have your brightness very high at all, and brightness is different from contrast.
Additionally, make sure the contrast on the screen matches your surriundings! There's no reason to have your brightness very high at all, and brightness is different from contrast.