Photochromic lenses will change to grey when in sun,usually is clear lentes , so is suitable for indoor and outdoor use.
the yellow line is the demarcation line. They can help first-time buyers how to wear the glasses. You can use the glasses cloth around your nails and then take it out .don't worry that your glasses will scratch, our lens are hard.
Comfortable for prolonged wearing. It about 22 g.
Supplied in a high quality case and cleaning soft cloth
If you have any question, pls feel free to contact us