Applicable in various environment like home, offices, and schools, these test cards allow you to easily evaluate the blue light blocking effectiveness of your glasses. effective eyecares whenever necessary. Suitable for individuals who spend long hours use electronic device, such as students, office worker, and programmers, as well as those concerned about maintaining eyes. Accurately test the effectiveness of your glasses with this set of blue light test cards. your eyes from harmful electronic device radiation. Improve your eye health with these user friendly glasses test cards. Stay aware of potential eye strain and enjoy enhances visual comfortable. This anti blue light detection card is a pratical tool. The strong the blue light, the deepthe color change, which is convenient to test., Manufacturer: NYCEMAKEUP