A. Computer monitors should be approximately 18" - 24" away from the eyes. The top of the monitor is best set at eye level so that the eyes gravitate toward the center of the screen.
B. Try to avoid glare from the light.
C. Computer monitors should be set directly in front of the user
D. Keep elbows in close to the body.
E. If seated, thighs should be parallel to the floor and about a 90° angle with the calves.
F. Use an adjustable chair, preferably with padded arms. Adjust the chair or work surface (if possible) to the correct position. Avoid leaning forward or to the side; sit at a slight recline with back against back of chair. Do not lean on work surfaces. Do not lean on elbows or armrests. Keep neck and shoulders in a relaxed position.
G. Place keyboard in a comfortable position (preferably on an adjustable keyboard tray) and use a wrist/palm rest.
H. Place feet flat on the floor or on a footrest and do not crowd the legs or body into a cramped or cluttered work space.
Use a document holder to keep working documents at eye level with the screen.
To avoid eyestrain, follow the 20/20/20 rule. Every 20 minutes, take a 20 second break to focus on a spot 20 feet away.