Comfort: an eyelid does not feel a lens due to a thin (0.05 mm) regional edge, biconvex design and smooth surface. A lens "holds a form", that provides lightness in handling the lenses of any refractions. Construction of lens : 1. An optical area is a minimum central thickness (0.038-0.04 mm), accordingly, the level of кислородоснабжения allows the mode of the flexible carrying, steady maintenance of refraction; 2. Regional type - provides the optimal landing at sufficient mobility of lens, eliminates discomfort from contiguity of century and edge of lens, allows to avoid the increase of mass and thickness of lens at high refractions. Dryness: stability of parameters, stability to the albuminous deposits, stability to dehydration.