Some graphics for detecting red-green color blindness can be used. For example, the red blind with two numbers on the left and right can't see the number on the left and the green blind can't see the number on the right. After reciting, remember that the right side is 6 when you see the left 4, remember that the right side is 0 when you see the left 3, and so on.

In addition, some pictures are skillful. For example, color-blind and weak pictures see deer, while normal people see cows. Others, such as a normal person with color blindness and weak color, see 1327 is 4284. These can all be leaned back.

Extended data:

Mainly light red and light green cross interference tester. If he is color blind, he can only see one color, so he can distinguish the numbers formed by poor color.

Reading rules The approximate tone of the correct answer in a picture is different from the background color. For example, the correct answer picture is a warm tone dominated by red and yellow, and the background color in the picture is a cool tone dominated by blue and green. If the picture you see at first sight is different from the correct answer, it is because color blindness is sensitive to the light and shade of the picture. If you look closely at the small squares or circles that make up the wrong figure, they are not all of the same color.

Baidu encyclopedia-color blindness checklist