What grade is Mao Yuanchang's lens?

Mao Yuanchang glasses belong to the mid-range. Mao Yuanchang is a brand that produces, manages, processes and sells all kinds of myopia glasses, sunglasses, contact lenses and reading glasses under Mao Yuanchang Glasses Co., Ltd., a century-old brand in Hangzhou, and has been recognized as a well-known trademark in China by the State Administration for Industry and Commerce. Mao Yuanchang not only has advanced optometry equipment in China, but also has gathered a number of senior optometrists and optometrists, who are good at the inspection and fitting of adult progressive lenses and various difficult eyesight.