Danyang Xingda optical device Co., Ltd., founded in 1988, is the largest professional manufacturer of ophthalmic instruments in China, such as optometry trial lens set and trial frame. The company has passed ISO9001 international quality system certification and ISO13485 medical device quality management system certification. The company's main products: full aperture metal bright ring, reduced aperture plastic ring two series. Its model has 266, 232, 158, 104, 48 and other specifications of optometry trial lens set. Large aperture, reasonable configuration, accurate optometry.It is your ideal professional optometry tool.