Visitors try VR devices during the 16th Optics Valley of China International Optoelectronic Exposition and Forum at the China Optics Valley Convention and Exhibition Center in Wuhan, capital of Central China's Hubei province, Nov 13, 2019. The three-day Optics Valley of China International Optoelectronic Exposition and Forum kicked off here on Wednesday. [Photo by Xiong Qi/Xinhua]