There are three main types of reading glasses on the market, namely single lens, double lens, and progressive multifocal lens. A single lens can only be used for close viewing, and glasses need to be removed when looking far. A bifocal lens refers to the upper half of the lens used to see far and the lower half of the lens used to see close. However, this type of presbyopia lens has a jumping phenomenon in the object and is not aesthetically pleasing in appearance. Progressive multifocal mirrors can meet the needs of different viewing distances, with excellent appearance. The popularity rate has been increasing year by year in 2019, and the first generation has been adapting for a long time.