Several Methods for Detecting Color Weakness
Disease description:
I always have trouble accurately distinguishing some similar colors when I look at them. I've heard there are methods for detecting color weakness, and I'd like to learn more. I want to know what types of color weakness detection methods are available and which ones are the most accurate and convenient.
Doctor's answer (1)
Dr. Wang Shuai
Color weakness, also known as abnormal color vision, is mainly categorized into types such as red-green color blindness, blue-yellow color blindness, and total color blindness. The following methods are commonly used for color vision testing:
1. Pseudoisochromatic plate test: This is the simplest, quickest, and most widely used method for color vision testing. It uses dots of different colors but with the same brightness to form numbers or patterns. The subject should read the numbers or identify the patterns at a distance of 0.5 meters under natural light, and must complete the task within 5 seconds.
2. Hue arrangement test: The subject is given a set of color samples and asked to arrange them in order of hue. The accuracy of the arrangement indicates the nature and severity of any color vision deficiency.
3. Anomaloscope examination: Based on the principle of mixing red and green light to produce yellow light, this test assesses color vision deficiency by analyzing the ratio of red to green light that the subject combines to match the yellow light.
4. Color vision analyzer: This is a more advanced instrument capable of providing precise color vision assessment, suitable for use in medical facilities.
5. Online color vision tests: Although less accurate than the above methods, these can be used as a reference for preliminary screening or when visiting a hospital is not convenient.
