The below guidelines are courtesy of Workrite Ergonomics click HERE for a link to the complete ergonomics page, including a video on setting up an ergonomic work area:

A.Adjust seat height, thighs should be approximately parallel to the floor. Seat pan short enough (front to back) for knee clearance and with a waterfall front edge.
B.Adjustable back rest to accommodate the normal curve of the lower spine.
C.Articulating monitor arm supporting flat panel display. Top one-third of the screen at or below eye level; distance from operator a minimum of 18", typically at arm's length.
D.Elbow relaxed. Lower arm open at least 90°-100° to upper arm with keyboard platform set at 0°-6° negative tilt.
E.Wrists should be a natural extension of the forearm, not angled up or down.
F.Keyboard flat at elbow level with palm rest to support hands during rest.
G.Feet resting firmly on the floor; footrest needed if feet are not supported by the floor.
H.Document holder in line with front of monitor. Height and angle adjusted for the comfort of the user.
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