These are multifocal lenses that correct your vision at different working distances from reading distance to far distance. The spectacle lenses do not have visible lines that separate the segments, so cosmetically they appear just the same as single vision lenses. There is a continuous gradual change in prescription throughout the lens. The distance vision in the lens is usually directly in front of the pupil and near vision in the lower part of the lenses. They may take a while to adjust to if you have been wearing single vision lenses before trying them.