Bifocals, multifocals, and progressive lenses are popular with individuals who want lenses that combine a distance prescription with magnification that enables them to overcome the limitations imposed by “presbyopia” (age-related inability to focus on reading material). However, these lenses do have their drawbacks. For one, incorporating different lens powers for distance and near vision into one lens limits the size of the portion of the lens with the power needed to perform a given visual task. In addition, the lower near-focusing portion often gets in the way when viewing objects at a distance or going down stairs. Thus, some individuals opt for “single vision lenses,” each of which may be solely dedicated to distance vision, intermediate vision, or near vision. Single vision lenses are often considered for work as a second pair of eyeglasses to complement a pair of multi-focal lenses or to use in task-specific situations.