The anti-blue light lenses on the frames still have logos because lens manufacturers will hide their own anti-counterfeiting logos when manufacturing lenses to prevent some small factories from pretending to manufacture lenses. This sign is usually very small and requires careful observation to spot. At the same time, the lenses of anti-blue light glasses also have their own special markings. For example, some lenses will be coated with a specific coating or engraved with specific patterns on the lenses. Therefore, even if the lens is anti-blue light, there may still be a logo or other special markings.