It is important to adjust your workstation so that:
- The chair height allows feet to be flat on the floor or on a footrest.
- The backrest supports your lumbar curve.
- There is adequate clearance between the desk and thighs.
- Thighs are parallel to the floor.
- Shoulders are relaxed and elbows are at about a 90 degree angle when hands are on the home row of keys (a-l).
- Wrists are straight when resting on the home row of keys.
- The screen is set at a comfortable viewing distance (at approximately arms length).
- The top of the screen is set at about eye level.
Laptops and notebooks
For laptop and notebook computers, the setup is basically the same configuration as for a desktop computer, but the important thing to remember is that laptops are made for convenience, not for comfort.
So you need to add auxiliary items to the laptop in order to be safe and comfortable. Attach an independent keyboard and mouse, and have your laptop up on a riser so that the top of the screen can be at eye level. Alternatively, attach a monitor to your laptop and have your laptop off to the side, and then adjust your monitor position as you would for a desktop computer.
Resources
Introduction to Computer Comfort
Adjusting your chair
Adjusting your desk
Adjusting your laptop or notebook computer