Contrast in icons and pictograms

Hi everybody!!

I have checked out a lot of information about the Success "Criteria 1.4.3 Contrast (Minimum)" and in all cases it just refers to text and images of text. What happens to essential images such as icons, pictograms which do not contain text? Do not they have a minimum contrast ratio?

All of us know that some images should have a minimum contrast ratio in order to be noticed by eyesight people.

Best Regards and thanks in advance,
David Torres Leal