1.56 Photogrey Round Top HMC Bifocal Finished Lens

1. Photochromic Function    
The photochromic materials in the lens can automatically adjust the tint depth according to the intensity of ambient light. In indoor or low-light environments, the lens remains transparent without affecting normal vision; under strong outdoor light, it darkens rapidly—functioning like sunglasses to block ultraviolet (UV) rays and harsh light, thus protecting the eyes.    
    
2. Bifocal Design    
Adopting a round-top bifocal design, the upper part of the lens is the distance vision zone (for viewing distant objects), and the lower part is the near vision zone (for viewing close-up objects). Compared with flat-top bifocals, the round-shaped reading zone of this design has a less obvious dividing line. However, wearers need to look further downward to obtain the same width of near vision field as that of flat-top bifocals.