Shamir OfficeTM Lens Users - benefit from the optimal lens designed for computer work and enjoy clear vision for objects positioned up to 10 ft. (3 m)*. Based on Shamir Optical Industry's innovative Eye-Point TechnologyTM, Shamir Office drastically reduces all signs of computer vision syndrome and enables users to hold their head and neck in the natural 15° position. | Progressive & Bifocal Lens Users - lift their heads 20° when they are working on a computer, because they must use the intermediate and lower lens areas. As a result, they strain their neck and shoulder muscles. In addition, Bifocal users have limited clear vision ranges: up to 1.3 ft. and from 6 ft. and up. There is no clear vision in and around the computer area. Due to distortion levels, Progressive lens users also see a limited picture in and around the computer area. | Single Vision Users - must lower their heads when they are working on a computer to an unnatural 45° tilt, creating neck, back and other Computer Vision Syndrome problems. In addition, single vision users are limited in their field of vision to around 1.3 ft. As a result, the screen appears unclear. |