One of the problems that occurs with many computer screens is that they are either too high or too low. Hence, you are looking more upward or more downward. This can result in some the physical symptoms of neck and back ache.
The screen should be at a comfortable height for you to look directly at it. The ideal placement is so that the top of the screen is at eye level. This is so that you look in the ideal gaze angle of 10-20 degrees below the eye. This keeps the eye from getting dried out from looking upward where the eye is more wide open.
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