1)Product Variety :UV400+EMI

2)Color:brown,grey

3)Abbe:38.0

4)Refractive index :1.56

5)Diameter :70mm/65mm

6)Power range:SPH 0.00 ~ -6.00 CYL -0.25~ -2.00

                      SPH+0.25~+4.00 CYL -0.25~ -2.00

7)Features :Return lenses are produced of high quality, low density, and middle index (1.56) photochromic monomers. The photochromic dyes are fully incorporated into the material rather than applied to the surface. The lenses keep the ability to respond to UV light longer and are more color consistency.

       Transmission properties of Return? Gray and Brown lenses are very superior compared to other photochromic lenses in the market; they can reach 20% ~ 21% transmittance after 15 minutes of darkening by ISO standard solar simulator. When faded indoors, Return? Gray and Brown lenses return back to 60% ~ 63% transmittance within 2 minutes.

        Transmission drop of the darkening state mainly happens within the 30 seconds (absorption increase of more than 50%), and makes the darkened Return? lenses like a real sunglass lens.

8)Semi-finished lenses are available

9)We can supply RX prescription lens