One of the most commonly used and common examinations in clinic is color blindness and color weakness. We go to school, high school, university, work and work, and one of them is color blindness. We will see that the doctor will take out a color-blind book and let you recognize some words and patterns. If you can't recognize it, the doctor may tell you that you are color blind or weak. The most commonly used method is pseudo-homochromy, also known as color blindness. In the same color, there are pictures with the same brightness and different spots, and there are also pictures with the same color and different brightness.

Normal people are distinguished by color, while color blindness is judged by light and shade, so they will make wrong answers. Color-blind books are examined under natural white light. The distance between the examinee and the color-blind book is about 50 cm. People who can distinguish correctly within 5 seconds are normal, and those who can't distinguish completely are color blind. Color vision disorders can be divided into color blindness and color weakness according to the degree of color blindness. Red-green color blindness is the most common color blindness, but there are also color blindness. The method of color blindness test is that under natural light, the subjects read the numbers or figures in the pattern within 5 to 10 seconds.

Read the instructions carefully to determine whether the subject is color blind. Color line colorimetry is to collect some new wool of different colors and cut it into neat short strips. In natural light, the subjects took out a piece of wool as a sample and asked them to pick out the wool with the same color as the sample in a few seconds. Observe the accuracy of the selection results and record them. Color blindness is a complete pyramidal dysfunction, which is different from night blindness. The patient showed darkness, photophobia and sudden blindness. The color world in his eyes is gloomy, just like watching black and white TV.

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