What is progressive multifocal presbyopia? Progressive multifocal glasses are gradual lenses, which gradually increase from flat light or low degree to high degree to realize the far, middle and near space vision function under the condition of central gaze. As the added value continuously increases gradually in the gradient area, the wearer can obtain continuous clear vision from far point to near point through lenses at appropriate eye positions. This design conforms to physiological optics and has good adaptability. Magnification Choice The top of the lens can clearly see the distance. The middle of the lens can be used to watch TV and computer. The bottom of the lens can be used for reading. You can adjust your vision by moving your eyes up and down as needed. If you are wearing progressive multifocal glasses for the first time. Please note that most people need an adjustment period of around ONE TO THREE WEEKS before wearing progressive multifocal glasses,but the adjustment period varies from person to person. Therefore, we recommend that you wear glasses for no more than 1 hour per day for the first five days after receiving them. From the sixth day to the tenth day, you can wear it for more than one hour a day, depending on the situation, and after two weeks, you can wear it according to your actual situation. Function: *Blue ray blocking - It can absorb high-energy blue light. *Clear lens - The lens has high light transmittance. Less reflective, no affect reading, and almost no color difference. * UV protection- Anti blue ray lens protect the eyes from ultraviolet radiation and block UV400. Perfect Readers for men women reading, video gaming and computer reading. Package Content: 4 xBlue Light Progressive Multifocus Reading Glasses, 4 x Soft pouches, 1 x Cleaning Cloth. All packaged in a mail box The womens fashion glasses is made of extremely lightweight and strong PC material that does not compress the nose or clamp the head. Polycarbonate Lens to be sure that colors are true and undistorted, provides the perfect balance between eye protection and viewing quality.Stylish square frame design can perfectly match various face shapes. In short,it is a high quality readers that can be shared with family, friends or partners.