For many people around the age of 40, they begin to have difficulty focusing at close range or reading range. If you already wear glasses, the first sign that something is amiss is when you are unable to focus on small print or 
objects that are close. This is when your eye glass professional will advise you that you may need bifocal lenses for your eyeglasses.
Bifocal lenses are suggested so you don’t have to have two pairs of glasses, one for reading and one for other visual wear.
Progressive lens are bifocal lenses without the line that separates your two viewing focal points. There is a difference between bifocal lenses versus progressive lens eyeglasses. Actually there are advantages and disadvantages.
Advantages
• No sudden image jump from near to distant power lens
• An endless number of focal points to view objects at various distances
• No visible unattractive line where your bifocal power ends or begins
• More natural feeling vision when viewing near objects
• A variety of lens designs to fit nearly any application including individuals who work on computers for most of their day
Disadvantages
• If this is your first time wearing, there is a short period of time for acclimatization
• More costly than a typical pair of bifocal lenses
Progressive lenses are becoming more and more popular because bifocal wearers are identifying the advantages progressive lenses are offering along with the large variety of progressive lenses that are not offered in the marketplace. As technology has developed, the cost of the progressive lens has decreased over time.
Most people who wear bifocals prefer progressive lenses but are unable to adjust to wearing these lenses comfortably. This is due to minor distortions at the peripheral regions of the bifocals which are produced by the blending of the bifocal.
Many bifocal eyeglass wearers don’t find these slight distortions a real issue. To adjust to the progressive lens, you will require some slight changes in horizontal eye and head movements. Some wearers can adjust in a matter of hours. For those eyeglass wearers who are unable to adjust to the progressive lens, a regular line bifocal may be the better choice of lens.
With the technology that has developed with the progressive lens, there are companies that manufacture specifically for those individuals who work in a computer environment for much of their visual day.
There are advantages and disadvantages to wearing progressive lenses or bifocal lenses. Many eyeglass wearers find the progressive lenses advantages outweigh the disadvantages. One of the main reasons that many eye glass wearers don’t purchase the progressive lenses was the cost of the glasses. However, these eyeglasses are becoming less and less expensive as they are being manufactured by many different companies and more people prefer the progressive lens over the bifocal lens each day.
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Very Informative post. I understand that a bifocal lens maintains a balance between near vision and distance vision. While the progressive lens gives you the immediate distance that bifocal can not do.