Bifocal Lenses are prescribed if you need correction for two fields of vision and a line or “Segment” separates the two focal points.

The upper part of the lens is generally used for distance vision, while the lower part is used for near vision.
Occupational bifocals can be specifically designed with the Intermediate or “computer” distance in the upper part of the lens and the “Near” or reading power in the lower segment.
Bifocal lens design offer a full field of view in the upper portion and either 28 or 35 millimeter width for the lower portion.
Unless otherwise specified in the notes section of your order we will assume the bifocal will be to correct distance and near vision.