The picture below is often called a color-blind book. It consists of dots with the same depth and different colors, which can be seen clearly at a distance of 0.5m under natural light. Color blindness should be straightened when checking, and each picture should not exceed 5 seconds. Color blindness is difficult to recognize, mispronounce or be illiterate. According to the color blindness table, you can confirm what kind of color vision abnormality you belong to. This is also the method used in driving test and physical examination.

Distinguish color blindness from color weakness, and check my own color blindness and color weakness. According to the "Regulations on the Application and Use of Motor Vehicle Driving License", the applicant's color vision cannot be red and green, but there is no restriction on the weakness of red and green.

Red-green blind test

Test instructions: The codes in red and green are also clear and bright, which means that the inspected eyes have the best vision whether they wear glasses or not. The green area is clear and bright, indicating that myopia correction is high and hyperopia correction is insufficient. The red area is clear and bright, indicating that myopia correction is insufficient and hyperopia correction is high.

Test chart of color blindness and color weakness in driving school

The sooner the better, the answer will usually be available in 3 seconds, and the longest time should not exceed 10 second.

1. In red-green color blindness, red blindness can only find purple lines, green blindness can only find red lines, but red-green weakness and normal people can find these two lines.

2. Under normal circumstances, it should be a photo of a cow. If you see "deer", you may be color blind or weak.

3. Among the red and green blind people, the red blind can read 6, the green blind can read 2, and the red, green, weak and normal people can read both words.

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