Alvita presbyopia glasses are available in the most common prescriptions from +1.00 to +3.50. They are made of quality, lightweight materials that provide great comfort without sacrificing durability. The lenses have a high optical quality that prevents distortion, lightweight construction and scratch-resistant coating. Each model comes with a matching case and lanyard. All Alvita presbyopia glasses come with a 24 month warranty against manufacturing defects. CE - conforms to European standard EN 14139:2063.