Compact Mens & Ladies Folding Reading GlassesThese small, foldable reading glasses fit into a thin, carry anywhere plastic container and fold to just 1. 3 cm in height. The special 90 degree spring loaded hinge that allows them to fold down to just 1. 3 cm (1 2 inch) height allows them to achieve this. Specifications: With their slingshot hinge, these adaptable folding reading glasses fit faces of all shapes and sizes.