1. Photochromic Function    
The color-changing characteristics of photochromic lenses are essentially "adaptive light adjustment" - using ultraviolet rays as a trigger signal, through "rapid darkening, slow fading, uniform color change, and coordinated protection", it can achieve "a pair of lenses replacing ordinary corrective lenses and sunglasses", which is perfectly suitable for people who "frequently go in and out of the house" and "have a lot of outdoor activities" (such as office workers commuting, middle-aged and elderly people taking outdoor walks, and students going to and from school).   
    
2. Bifocal Design    
The horizontal width of the near zone of the flat top lens (22~28mm) is wider than that of the same size dome lens (the horizontal width of the round near zone is about 18~22mm). When reading wide books, newspapers or computer screens, you don't need to turn your head frequently and can see more content at one time. It is especially suitable for middle-aged and elderly people who read for a long time.     
   
3. Blue Light Protection:    
"Precise Protection + Friendly Experience" - Using "selective filtering" technology to avoid the harm of blue light, "multi-functional integration" to adapt to daily needs, and "scenario-based design" to meet the needs of different groups of people, it perfectly solves the "blue light problem in the electronic screen era"