1.- About the monitor of the computer:
- light and matt colours: to prevent reflection.
- no flashes to prevent visual fatigue.
- a dirty screen, with dust, is bad to breathe.
- screen must be to the height of the eyes.
- About keyboard:
- to avoid slichings.
- About chairs:
-stability to prevents involuntary movements
- a back is obligatory.
2.- Another advices.-
- Don´t stay more than an hour without moving.
- Sit correctly looking in front of you without moving your head; looking at your left and then at your right.
- Wrists and fingers pain: wash them up with cold water. It helps to a good circulation of the blood and another pains