These are 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. Some people take a little time to adjust to the different viewing experience this presents, particularly if having been wearing single vision lenses before where the whole lens is assigned to the distance vision only. They do however provide the great benefit of no longer having to ‘switch glasses’ for distance and near.