1.7 1 refractive index glasses, which is the patented product?

The lens with refractive index of 1.7 1 is a patented product of Yue Mingjing, mainly aiming at the principal refractive index.

Thinner, lighter, clearer and more durable. The patent number is ZL.

20 15

1

0 159288. 1

.

The domestic first lens brand is worth owning.