From a medical point of view, contact lenses for correcting color blindness and color weakness are generally effective for patients with color weakness, but not for those who have finished color blindness. Some patients with color blindness and color weakness who come to the hospital to consult glasses are in order to pass the driving school physical examination, but this is not desirable. Once they get away with it, they are likely to have great risks to people and themselves, which can easily lead to accidents. Moreover, some color-blind patients buy color-blind weak correction glasses online at will, which will do harm to their eyes without being tested by professionals and instruments.

Online shopping for color blindness correction glasses is not reliable: generally, glasses sold in China must have Chinese labels, but many glasses sold online are only in English, and such contact lens products do not meet the instructions. Moreover, at present, contact lenses for color blindness correction are not mass-produced like other myopia contact lenses, and there are fixed and qualified manufacturers. The material, oxygen permeability and radian of this online shopping contact lens are not guaranteed.