Digital Ray-Path^® is state-of-the-art lens design technology based on a complete eye-lens system simulation taking into account the real lens position in respect to the eye to optimize the lens in every gaze direction. Each lens is calculated by simulation of thousands of rays minimizing the oblique aberrations point-by-point on the entire surface, guaranteeing the best visual quality for all distances and gaze directions. As a result, a unique digital (free form) lens completely optimized and calculated for each wearer is obtained.