Useful. According to the website of seeking medical advice, timely optical fiber coating will cause skin lesions in vivo. Removing Shi Ying optical fiber coating in vivo is useful and plays a positive role. Shi Ying optical fiber coating is a kind of optical fiber made of timely glass. The core of Shi Ying fiber is quartz glass fiber, which is coated with a layer of boron, fluorine or other polymers.