These are glasses with lifting lenses that can be removed from the field of view when not in use. Dual frame allows combining two pairs of lenses.
NeckTec has patented four-bar linkage for a lens lifting mechanism while in the process of developing AR glasses. Thanks to the precise calculation of the levers' length, their attachment points and the angles of their rotation, it was possible to achieve what the designers of glasses have never been able to. The lenses in raised position completely free the field of vision. Nevertheless, in such position they do not touch the forehead. Being parallel to it, they do not get greasy on the skin.