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The growing demand of sustainable and biocompatible optical devices is stimulating the development of naturally derived biomaterials for optics and photonics.As a versatile biomaterial,silk provides excellent material characteristics that are favorable towards the generation of advanced optical systems.This review examines the use of silk as a material platform in optical applications.Recent advances in silk-based optical devices and multifunctional devices are summarized.The challenges and directions in further designing and fabricating silk optics are also discussed.We envision that silk will play a pivotal role in the future exploitation of sustainable,intelligent,wearable/implantable,and multifunctional optical devices.