DescriptionProfessional blue light test for testing polarized glasses, anti-blue light glasses, sunglasses, etc. Reusable test will be restored after 1-2 minutes. Small and exquisite, used in glasses shop, hospital and various optometry shops.Features- Color: Blue. - Material: Paper. - Size: Approx.6 x 4 x 0.1cm. - Paper material is durable and practical. - Reusable design, test will be restored after 1-2 minutes. - Professional test for testing anti-blue light glasses. - Test method: Step 1: Turn on the test lamp, shine light on the test area of the card, and the color will be blue and purple. Step 2: Put anti-blue light glasses in the test area, and do not change color when irradiated by the lenses. The blue-purple glasses are blocked, which are genuine anti-blue light glasses. - Small and exquisite, used in glasses shop, various optometry shops. - Warm Tip: Dear buyer, due to lighting effect, monitor's brightness, manual measurement, etc., there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand! Thank you!
