1.56 Photogrey Flat Top HMC Bifocal Finished Lens

1. Photochromic Function    
Its core feature is to automatically adjust the grayscale depth as the ambient light intensity changes. It quickly darkens in strong light (especially ultraviolet light) to block strong light and ultraviolet light; when returning to low light or indoor environment, it gradually returns to transparency without affecting normal vision. Its grayscale characteristics are developed around four dimensions: "response mechanism, color change efficiency, stability, and protection capability."
    
2. Bifocal Design    
Flat-top lenses are one of the mainstream design types of bifocal lenses. Their core feature is a horizontal straight line (flat top) on the upper edge of the near reading area. Through the zoning design of "distance correction area + flat-top near area", they achieve "one lens for two purposes", specifically addressing the dual vision needs of people with myopia/hyperopia and presbyopia.