Implications from the physiology of
the eye
- Do
not use blue for small objects (since human sensitivity for
blue is very low, particularly in the fovea)
- Blue
is a good background color (since human sensitivity for blue
is very low and since receptors for blue are roughly evenly distributed over the
retina)
- Neighboring
objects should not merely differ by their amount of blue.
- a
a a
(red, red with 50% blue, red with 100% blue)
- a a a (red,
red with 50% green, red with 100% green)
- If
red and green are used for small objects, these should be in the center (since
the sensitivity for these colors is far higher in the center).
-
If red and green are used as signals
(warnings) in the periphery, they should have additional emphasis (like blinking
or change in size).
- Black, white, yellow and blue can be
used in the periphery since the sensitivity of the retina is roughly the same.