Keep your keyboard directly in front of you so your hands are centered over the main keys. Place the mouse at the same height as your keyboard but keeping it as close to the keyboard as possible to minimize the reach. Never place the mouse where you have to extend your arm to reach it.
no closer than 18” and no further away than 36”. This relieves the visual strain of constant close work, gives your eyes room to relax and reduces tunnel vision – the further away the screen is, the less it dominates your visual field. Keep the monitor screen slightly below eye level. You should be able to read the screen with your eyes relaxed, looking straight ahead and slightly down, without tilting your head.
(such as phone, calculator, manuals, etc.) within comfortable reach. If you must extend your arm to use something, don’t stay in that position for long.
and/or reflections on your eyes.
This allows you to stretch out and not feel confined, as well as eliminating trip hazards when you sit down or get up.