cr39 1.56 photochromic lens
1.diameter: 70mm/ 65mm
2.abble value 38
3.transimission: over the 98%
4.specific gravity: 1.28
5.abrasion resistance: 6/ 8 H
6.photochormic brown ( grey, ....

Cr-39 1.499 progressive lens
1. diameter 70mm
2. long corridor: 17mm
Short corrider: 14mm
3. abble value: 58
4. transimission: over the 98%
5 Specific gravity: 1.32
6. Abrasion....

1.523 glass photochromic round-top bifocal lens

1.diameter: 65/ 28mm
2.photo grey
abble value 64
transimission: over the 87% ( faded)
transimission: over the 23% darkened)
density( g....

0.4usd/pair-2.0usd/pair

Cr-39 1.499 resin lens
1.diameter: 70mm, 65mm, 60mm, 55mm
2.abble value 58
3.transmission: over the 98%
4.specific gravity: 1.32
5.abrasion resistance: 6/ 8H
6.reflective index: 1....