Lenses for myopia, hyperopia, astigmatism, have only one power spherical, aspherical, double-side aspherical, and other designs, each of which provides different vision and wearing comfort.

It is a plastic lens caracterised by Lightweight and hard to break. Many other features include comfort, UV cut-off, impact resistance.
Plastic with a higher refractive index that will be thinner.

All Seiko lenses come fully coated.

Super Clean Coat (Hydrophobic, Oleophobic, anti dirt, 2 layers Gas treatment procedure)
Hard coat or anti scratch coating
Anti reflection coating (16 layers, Gas treatment procedure)
Ultra-violet cut-off coating
Impact resistant coating

Index          1.50
Material      CR 39 material Allildiglycol carbonate 
                  50 % lighter than conventional mineral lenses.
Fully  coated

Super Single Vision
Aspheric design lens with edges providing clearer vision and lenses are thinner and more lightweight. Front surface of which is aspheric.
Index          1.67
Material      MR-10 (Hard and flexible, 50% stronger than polycarbonate and 20%
                  lighter)
Aspheric with 10mm diameter spherical area in center
Fully coated

Index          1.67 with transition V
Material      MR-10
Gravity        1.36
Aspheric with 10mm diameter spherical area in center
Colors        Grey and Brown
Fully coated

Darkening within seconds.
Lightening in 5 minutes.

Variable filters available for the SSV 1.67 transition.

Flat and thin lenses in an index super high 1.74 with a 1.47 gravity.
Index          1.74
Material      --------
Aspheric with 10mm diameter spherical area in center
Fully coated

Double-sided aspheric design lens with a 1.67 index. Layer per layer organic quality, immune to large thermal fluctuations, ut to 100 degrees resistance.More powerful Scratch and pressure resistance.

Index          1.67
Material      Orgatech AZ
Water repellency
Lightweight
Heat resistance
Fully coated

For more details visit: www.seiko-optical.co.uk