Lianyungang TianNuo Optical Instrument Co., Ltd. is one of the principal manufacturers of TRIAL LENS SET in China, which was named Xinpu Optical Instrument Factory before July, 2001. Founded in 1958, we have been very experienced in and famous for TRIAL LENSES of both full-aperture and reduced-aperture, TRIAL FRAME, CROSS CYLINDER SET, RETINOSCOPY RACK SET and CONFIRMATION TEST FLIPPERS.【LEARN MORE 】