When wearing progressive lenses, a person gets smooth and continuous vision with near, middle and distant focal ranges. With bifocal lenses, the person gets clear vision with near and distant focal ranges only.
The progressive lens has a clear field of vision with no lines. It provides a graduated range of vision from near to distant. It also has intermediate vision which is perfect for using computers. The absence of a line on the lens gives the wearer a more youthful appearance. This lens is ideal for a person who wants a strong lens but who prefers a seamless appearance on each of the lenses.
Bifocal lenses allow the user to see objects that are far away and objects that are near. However, the user is not able to clearly see objects in the intermediate area between 3 feet and 20 feet away. The different viewing areas on the lens are separated by a line; the part above the line is for seeing distant objects, while the part below the line is for seeing objects that are nearer. A major problem with bifocals is that there is a noticeable image jump when the user switches from looking through one part of the lens to the other.