These glasses are designed to provide reliable special color-filter protections against excessive blue-light radiation screens, fluorescent lamps, white-light LED and energy- saving lamps. They are particularly suited for watching television and for computer work. They will relieve eye stress and increase your sense of well-being. Comes with a brochure explaining their use and care. Clip-on version also available for persons who wear corrective glasses. See the Additional Resources section of this website for a brochure with further information. (note: In the USA, use of the glasses is not permitted when driving a vehicle or operating a machine.)