Lens Index and Designs
1.76 The World's Thinnest Lens!*
Thinnest and lightest lens in the world: up to 47% thinner than conventional CR39.
Standard with SPS coating (super hydrophobic action + high scratch resistance).
Stock lenses available with full protection against UV rays.
Tint-able up to 85% ABS! Transitions availability.
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* 1.76 Bi-Aspheric Transitions
Tokai have glass availability in 1.90 index. For more information on the lens availability and ranges please contact us.
By implementing the Back Surface technology to the back side of the lens, we obtain a lens that is thinner and with less distortions at any point of the lens.
Both sides of the lens have flatter and thinner aspheric design technology applied, whereas aspheric lenses only have this applied to the front surface.
Tokai Back Surface
The Back Surface progressive lenses differentiate themselves from other progressive lens designs by simultaneously assimilating the progression zone, asphericity and power to the back surface of the lens (see picture to the left). This concept offers a superior optical solution, while maintaining a perfectly smooth spherical surface. Highly advanced production technologies allow continuous monitoring of the asphericity at each particular point on the back surface. Superior ophthalmic performance and substantial improvement of cosmetic appearance result in a very efficient and personalized design. Therefore, the Back Surface progressive lens meets the individual needs of each user!
Thanks to the freeform technology we obtain personalized progressive lenses with the following features:
- Increased field of vision up to 30%
- Reduction of float effects and distortions up to 35%
- Thinner and lighter than a traditional progressive