Your back is very important. Your body uses it both when you're standing and sitting. Bad posture is also unattractive. An injured back or neck can make even the most routine tasks a painful experience. Once Again, Dr. Grossman has some important advice about backaches:
The computer screen should be slightly below eye level (about 20 degrees). Copy should be at the same level as the screen.
Chairs should provide proper back support and be adjustable
Adjust the chair height so your feet are flat on the floor with thighs parallel to the floor
Adjust the worktable so legs and knees clear its underside