Glens are prefabricated spare pair of glasses for near sight. They are manufactured from high-quality Copolyester and weigh less than one gram. Their dimensions are less than those of a credit card and therefore they can be carried in a supplied case e.g. inside the card compartment of a wallet. They lie well on the nose in almost any position, special pads protect from unpleasant pressure or slipping. Three small knobs on the bridge of the nose assure good grip and provide easy position adjustment.