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:

 
New cutting method of ceramic block provides the high precision of the mold.
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