Optical design and fabrication play an ever-increasing role in our modern society as more applications for optics are developed, especially in the areas of imaging, sensing and illumination systems. Of particular interest is the ability to utilize modern design tools to reduce cost, augment manufacturability and enhance system performance. New materials and unprecedented capabilities to create and measure precise aspheric and freeform optical surfaces have created a whole new design space for imaging, while new computational tools have allowed more complex systems to be both designed and fabricated. These capabilities have extended to micro-optics, head-mounted displays and large optical systems. Hot topics for this congress include the fabrication of optics by lasers, additive manufacturing of optical components, the latest freeform design tools for illumination optics design and fabrication, micro-optics and the fabrication and use of optics from new materials, including the use of metasurfaces and other flat optical component techniques in advanced optical systems. "Optical Fabrication and Testing"