The fitting of contact lenses has fundamentally changed over the past 25 years. Unlike other areas of medicine, where advancements have led to new treatment methods that replace the old ones, the field of contact lens fitting still sees the use of older generation lenses despite numerous new developments. Technological advancements have yet to produce a lens that solves all optical and physiological problems. Even if one day materials of all hardness levels and the highest gas permeability become available, this does not necessarily mean that one will have the material of choice that allows a specific patient to see well and tolerate the lens comfortably for a lifetime. Conversely, it can also be assumed that in many eye diseases...