Some people are color blind and cannot see colored dots within a pattern. Microsoft has begun to support a Colorblind mode in Windows 10 for affected people.
If you want to check, if you are color blind, you can run several tests. This page provides such a simple test. The youtube video below runs also such a test.
(Source: YouTube)
If you can’t see the numbers within the dotted circles, you are probably color blind. In such a case, you can use the Colorblind mode, provided in Windows 10. MS Power User has spotted that and provided this article about how to use it.
1. Type ‘Color filter’ into the search box of your Windows 10 taskbar.
2. Click the command Turn color filters on or off shown in the search results.
(Source: MSPU)
3. Then set the option Turn color filters to On and select the appropriate color filter.
(Source: MSPU)
A more detailled discussion may be found at Windows Report within this article.