News Dear customers, weolcome to our website December 31,2019 The 27th Hong Kong Optical Fair 2019 November 20,2019 Control of dyeing method and dyeing effect November 07,2019 Vision X Dubai 2019 November 02,2019 2019 Guangzhou International Optics Fair October 16,2019 Dyeing principle of resin lens July 12,2019 2018 American Las Vegas International Vision Expo West September 27,2018 31st China (Beijing) International Optics Fair September 19,2018 Sydney optical exhibition, Australia June 07,2018 The 18th China(Shanghai) International Optics,2018 May 17,2018 1 ... 5 6 7 ... 12