Specification :

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/cm3): 2.3
3.photo brown
abble value 64
transimission: over the 86.5%(faded)
transmission: over the 24%darkened)
density(g/cm3): 2.3
4. high quality with low price
5. if you are interested in it, feel free to contact with me for details