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Staring at a computer can cause a lot of strain on your eyes, which can lead to a number of issues, such as migraines, dry eyes, and difficulty seeing. This is why you need to take proper precautions when you know you are going to be on the computer for awhile. Be sure your computer is at a position in which your eyes are on the same level as the monitor and if possible, wear glasses.
Avoid looking at your computer screen for too long. Take a break every half hour to give your eyes a rest from the strain. Staring at your computer can cause dry eye because you do not blink as often, so make an effort to blink every 30 seconds while you are at your computer.