Dereck works for long hours on his computer. he frequently experiences physical strain by the end of the day because he doesn't follow an important rule of ergonomics with the respect to the use of keyboards. what can lead to physical strain

Problems with strain and computers come from poor posture, distance from computer causing you to lean forward, height of monitor so that you are looking straight at it, keyboard flat on desk rather than on a keyboard tray that can be positioned and adjusted for your use, and taking 10 minutes away from computer per hour to decrease strain on your eyes, also get a monitor filter to decrease the glare.