A2 Crown
12mm Corridor Progressive New Design
A2 Vision Technologies provide new generation of progressive short corridor design - super-short corridor 12mm "Crown". The fitting cross is 2mm above the optical center and the recommended fitting height is 15mm.
Benefits of the design:
Following the tradition of A2 Vision design, the distance zone is clear and wide.
The peripheral aberration moved inside of the functional areas of the lens.
The new aspherical solution maximizes the width of the corridor area, unlike conventional
short corridor progressive design.
Gradual translate of the central line from the corridor to the reading zone leads to the wide
clear reading zone - the best solution for the super-short frames.
The design gets full addition power in the 12mm corridor length.
Cylinder Map
Power Map
Corridor section
Technical Data
Diopter | mm | |
Distance Width (2mm above MRP) | 0.5D 1.0D |
9.2mm 16.5mm |
Distance Width (8mm above MRP) | 0.5D 1.0D |
30mm clear |
Maximal nasal Astigmatism | -2.60D | |
Minimum Corridor Width | 0.5D 1.0D |
4.8mm 8.8mm |
Near Vision Width (12mm below MRP) | 0.5D 1.0D |
14.2mm 21.8mm |
Fitting Cross (above MRP) | 2.0mm | |
Start of progressive (above MRP) | 2.0mm | |
End of progressive (above MRP) | 12mm | |
Minimum Fitting Height | 15mm |
* Measured on base 4.50 addition 2.00D
Mold Availability
Bases | 2.50 4.50 6.50 8.50 |
Additions | 0.75 to 3.50 in 0.25D |
Refractive Indexes | 1.498 1.56 1.60 1.67 |
Possibility to produce by Free-form machines and insert for polycarbonate.
Marking dimension