Corridor Shifting Function Design

Corridor Shifting Function Design

In many progressive lenses,the additional power starts from the fitting point.
For this reason, the wearer may feel a sense of swaying, distortion or blurring when shifting his/her line of vision slightly from the front to the side.

In the Corridor Shifting Function design, the fitting point and the start point of the additional power are separated to ensure a power stabilization area, ensuring sharp frontal vision. In addition, to achieve ease of vision and accomodation, changes in the power stabilization area and progressive power corridor length are optimized for each added power.
(This design is used in Pursuit EV.)

World's First New Concept
  • Separation of the fitting point and the additional power start point.
  • The distance from the fitting point to the addition start point is reduced as the added strength increases.
  • The progressive power corridor is lengthened according to increasing added power.

Separation of the fitting point and the additional power start point

The distance between the fitting point (FP) and the additional power start point is decreased with increasing additional power.

Separation of the fitting point and the additional power start point

The length between the fitting point and aadditional power start point is shortened by increasing added power.

The progressive power corridor is lengthened according to increasing added power.

The length between the fitting point and aadditional power start point is shortened by increasing added power.

The progressive power corridor is lengthened according to increasing added power.

This results in a sharp field of long-distance vision and supported near-distance field of view.

The progressive power corridor is lengthened according to increasing added power.

Corridor Shifting Function design has been incorporated for:

SEIKO Individual Lens PursuitEV 1.67/1.60/1.56
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