correct vision at two distances ie, distance and near Disadvantages include no clear vision for intermediate distance. This has a disturbing dividing line and has “image jump”

These are aspheric lenses in which power gradually changes from distance correction at the top through intermediate powers to the near prescription at the bottom of the lens.

Advantages of progressive design are:

a) No lines in the way of vision and no image jump like in bifocals

b) Convenience of having a single pair

c) Comfortable head posture while doing computer work and better intermediate vision.

d) Available in a variety of materials and design traditional, digital and customized/personalised designs