Soft & Hard PALs

Most PALs in the market are designed based on the distribution of distortion fields caused whilst creating the power progression.These diagrams will help illustrate the designs from some better known PAL providers.

And due to Position of Wear concepts and other optimizations, Rodenstock PAL mappings are as follows:

   

       

It is clearly realized that visual fields are not compromised, whilst lowering the progression contours to offer reduced peripheral distortions.