Tips to prevent eye strain

Most people find it more comfortable to view a computer when the ‪eyes‬ are looking downward. But, ideally, the computer screen should be 15 to 20 degrees below eye level (about 4 or 5 inches) as measured from the center of the screen and 20 to 28 inches from the eyes. Any reference materials should be located above the keyboard and below the monitor. If this is not possible, a document holder can be used beside the monitor. The goal is to position the documents so you do not need to move your head to look from the document to the screen. Chairs should be comfortably padded and conforms to the body. Chair height should be adjusted so your feet rest flat on the floor. 

By following these measure, ‎Eye Strain‬ can be minimised to a large extent.