Change the height of the monitor so that the top of the screen is at or just below eye level. When looking at the middle of the screen, you should look a little bit down. Place the monitor at arm’s length or at least 20 inches (51 cm) away from your eyes.
How high should your computer monitor be? Your eyes should be pointed at a spot on the screen that is 5 to 10 cm below the top edge of the monitor.
When you use it, the top of the screen should be between 50 and 100 cm from your eyes. Your workstation should be at elbow height, and your hands should be able to rest between the keyboard and the edge of the desk. Even if you are working on a laptop, you should use a mouse and keep your workspace well-lit.
As a general rule, stay an arm’s length away from your screen. If the distance from corner to corner of the monitor is more than 20 inches, move it farther away.
In terms of placement, your screen should be between 30 degrees above and below your line of sight. The idea behind this range is that when we are relaxed, our eyes tend to look straight ahead and down.
Because the best way to look is slightly down, the screen should also be slightly tilted. So that you can see the screen from a 90° angle, the top edge should be a little further back than the bottom edge. So, the eyes may be able to keep their focus on both the top and bottom of the screen while keeping their distance from it.
In reality, the rule of thumb is to place your eyes (straight ahead) so that they are about 3/4 of the height of the viewing area on the screen. This should be true for any screen size that isn’t too big. About a quarter of the screen should be above eye level, and the rest should be below.
When the monitor isn’t placed well in relation to where the operator is standing, it can cause back pain and other aches and pains. The viewing angle and the viewing distance are the two things that make a difference. The “viewing angle” is the angle between the viewer’s eyes and the center of what they are looking at, which in the case of a computer work is the center of the screen (see Figure 1). The viewing distance is how far away from the screen the operator’s eyes are (see Figure 1). If the angle isn’t right, your neck and shoulders will be uncomfortable, and if the distance isn’t right, your eyes might get tired.