@verius @camoceltic Both super high and super low contrast are hard on people with vision problems.  Avoid thin fonts.  Try to avoid using specific colours as indicators because they can be confused with those with colourblindeness.

This stuff is aimed towards game dev, but there's some good thoughts that can still be garnered from it:  http://gameaccessibilityguidelines.com/

This is a biggie: https://community.highlandarrow.com/url/95718