BS Progressive lenses

Back Surface Progressive lenses

The Back Surface progressive lenses differentiate themselves from other progressive lens designs by simultaneously assimilating progression zone, asphericity and power to the back side of the lens.

This concept offers a superior optical solution, while maintaining a perfectly smooth spherical surface.

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BACK SURFACE APPROACH 

 

CUSTOM

PERFECT MATCH

STANDARD

CORRIDOR LENGTH

You define the corridor length:
11, 13, 15 or 17mm.

 You define the corridor length:
9, 11, 13 or 15mm.

 You define the corridor length:
11, 13 or 15mm.

FRONT BASE CURVE

You determine a more appropriate
front base curve:
standard, deeper or flatter.

 Tokai will determine
the most appropriate
front curve taking into
consideration the balance between
right and left power.

 Tokai will determine
the most appropriate
front curve taking into
consideration the balance between
right and left power.

INSET

Tokai will determine the inset per lens:
from 0,0 to 5,0mm per 0,1mm.
Custom according to all
appropriate parameters.

 Tokai adapts the inset
according to the power.

 Standard inset of 2,5mm

 

Thinner and lighter
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Increased vision field up to 30%
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Reduced distortion and floating side effects up to 35%