Specially designed , high precision glass lens ensures complete elimination of eye strain. Lens is coated with a special film to cut out UV-rays and glare, thus protecting your eyes. With feather touch movements the lens can be moved into the right location, to exactly match your normal position of working . It is ready to use item, needs no installation. It is rugged, needs no maintenance. It does not in any way interfere with the operation of the computer, mouse or keyboard. It is effective on all types of computer monitors. Applications: All persons above the age of 40 years who use computer regularly. Any person whose work involves reading the fine details on a computer screen. Persons who need to work for long hours on a computer, leading to considerable eye strain.