There are 2 freeform progressive lenses with a so called ‘square design’ : NWS and Sereno.
NWS offers the widest field of vision and the least distortions among the freeform progressive lenses. This performance is achieved thanks to the biaspheric design and progression on both surfaces, combined with the Neo Wide Area design. Aberrations are reduced by up to 21% compared to traditional aspherical progressive, and distributed to maximize the far and near vision, while ensuring a smooth intermediate progression.
NWS has a flexible inset you can specify from 0,0 to 5,0mm in 0,1mm steps, or Tokai can calculate it for you by giving us the reading distance ranging from 25 cm to 80 cm.