Computer Eye Strain Explained (and How to Avoid It)
Sit Up Straight

It is easy to slouch when sitting in front of a computer for extended periods of time. Be sure the computer monitor sits four to eight inches below the eyes to allow the neck to relax while reading or typing. Sit up straight to avoid neck, shoulder and back pain, which can affect vision. Invest in a sturdy chair that is comfortable and promotes good posture. A chair with a hard back can be useful for support while a softer seat might increase the urge to slouch.
Take Breaks

If it is not possible to break up the day and take long breaks from looking at the computer, then concentrate on taking several five-minute breaks throughout the day. Set a timer on the computer or a smartphone for every hour. When the timer goes off, take a walk around the office or get outside for some fresh air to give the eyes a break. Sit in a shaded or dark area and close eyes for several minutes to avoid overstraining them before returning to the desk.