Move!
There is no ideal posture when maintained for a long time. Strain increases with immobility. The inability to move increases discomfort of any position. So there is no ideal fixed position.
- A well designed workstation, however, will enable you to work in a variety of comfortable working postures.
- Change posture regularly, also subtle changes help, e.g. by moving the back-rest.
- Also your eyes shall move: take vision breaks, looking at something at a farther distance or closing our eyes.