In order to ensure the superiority of its progressive lenses, Nikon R&D completed thorough testing. Using an eye tracker device, R&D researchers were able to determine the usable surface of a lens.

With a standard lens, the wearer experiences visual stress and needs to move their head around to find the right spot. With Nikon, the usable surface is a lot wider, the peripheral portion of the lens can be used, and visual stress is removed.