Jewelry, Eyewear and Watch Design Glens reading glasses by Glens Glens are prefabricated spare pair of glasses for near sight. They are manufacture from high-quality copolyester and weigh less than 1 gram. Their dimension are 78mm x 21mm x 1mm which is smaller than a credit card size therefore they can be easily carried. 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.