We've been asked a few times about "high Definition Lenses". This is really just a brand name that a company has decided to tag the lenses. The are basically the same as a Free Form lens in Trivex that we do. It offers the widest field of view in focus (Free Form technology) combined with Trivex (zero distortion) lens material. If want high definition, go with the Free Form Trivex lens on offered for almost all our products available with prescription lenses. Read more about Free Form prescription lenses. Add Free Form Prescription lenses to your cart here.