Information should not be presented in colours that require perfect colour-vision. Contrast is important. Black text on a white background is easiest to see. Black writing on a pale yellow or pale green background is also easy to see.
- Colours of keys, levers, and controls should be harmonised so that the light intensity in the field of vision is even. Surrounding areas should be matt to avoid glare.
- Text resolution should be of a quality so that the text can be read when maximally enlarged.
- The standard text resolution should be as fine as possible and adjustable.
- Picture caption.
- Red and green text should never be used together because there are many colour-blind persons who can not distinguish between red and green. If red or green text is used, it is important that the information is also presented in another manner such as with symbols or in relief.