The top line of the screen is approximately eye level, user's head sits squarely on the shoulders. For users with bifocals, monitor height is adjusted to allow comfortable viewing. There is only minimal glare reflected from the screen. In a neutral wrist posture, the wrists are bent very slightly upward. The user does not strain his or her neck to look at documents.
User takes breaks from the keyboard and mouse.
Look for awkward reaches required to answer the phone or retrieve frequently used books, etc.