What is ADD Power on Progressive and Bi-Focal orders?
A Progressive lens provides a continuous increase in the lens power as the eye moves down from the distance viewing to the near viewing range. The additional plus power amount needed for near vision is called a Bi-Focal which is really two lenses combined into one which provides a distance viewing area and a near viewing area. The “ADD” numbers on your Rx indicate the strength of the reading segment of your lenses.
