Colors : low vision vs. autistic spectrum

[a11yTash]

Issue
I have been using the posters in my workshops and every single time, I have users who have trouble with the formulation "use bright contrasting colours" in the Don't of the Autistic Spectrum poster vs the "use good colour contrasts and a readable font" in the Do of the Low vision poster.
They always think that it will be impossible to make colours accessible for both people on the autism spectrum and people with low vision.
Suggestion
I would suggest changing the formulation of the Autistic Spectrum poster for "use bright and vibrant colours" instead of "bright and contrasting". Indeed, it is more the vibrance of the colours that make it difficult for people on the spectrum, not the fact that it's contrasted.