Donegan OptiVISOR DA-7 2.75 X Magnification at 6"The Genuine Donegan OptiVISOR is a precision binocular headband magnifier that permits unrestricted user efficiency while reducing eye strain. It leaves both hands free and allows three dimensional vision. Used by anyone whose profession or craft requires close accurate work. Can be worn over prescription or safety eyeglasses. DA 7 gives 2. 75 X magnification and focuses at 6" This is the original OptiVISOR proudly made by Donegan Optical Ltd right