Below is a list of the current color blindness test charts and standard answers, so that you can easily deal with the pitfalls of the color blindness test. (For pseudo-color blind people) Color blindness test methods which kinds of False same color map Often called the color blind book, it is the use of the same degree of shades of color but different colors of the points to form a number or figure, in the natural light at a distance of 0.5m to read. The color blind book should be placed in the right position during the examination and each figure should not exceed 5 seconds. If a person with color blindness has difficulty in recognizing, misreading or cannot read, he/she can confirm what kind of color abnormality he/she has according to the color blindness table. Color harness test is a different color, different shades of woolen harnesses mixed together, so that the examinee to pick out the same color as the standard harness.
This method is time-consuming and only roughly qualitative but not quantitative, and is not suitable for large-scale screening. Color mixing tester is a spectral instrument designed by Nagel according to the principle of red+green=yellow, it can quantitatively record the amount of red and green light required to match to determine the red and green sense of abnormality, this method can be both qualitative and quantitative.
Color blindness test chart look at the chart skills Look at the opposite color, normal we look at the middle of the number or pattern, color blind or color weak will look at the surrounding color, look down the middle of the formation of the hollow why the number or pattern.