Impairment Visualizer is one of the tools in the tool box.
Your images may need to be accessible to readers who have visual impairments. This tool simulates how your images would appear to a reader who has cataracts and color blindness.
Cataracts are an opacity or clouding of the lens which reduces its transparency.
Color blindness is a decreased ability to see color or distinguish differences in colors.
The Bloom Accessibility Checker dialog box has a check box with this label:
No essential information by color.
The Impairment Visualizer can help you determine if you can select it.
Bloom Accessibility Checker dialog box
https://en.wikipedia.org/wiki/Cataract
https://en.wikipedia.org/wiki/Color_blindness
https://stackoverflow.com/.../simulate-cataract-vision-in-opencv
http://www.colourblindawareness.org/.../types-of-colour-blindness/