Varifocals

"If you require both near and distance vision corrections, then you are probably presbyopic - a natural condition which many people experience in their mid-forties onwards. One solution is to have different pairs of spectacles for reading and distance vision. However, this can be inconvenient. Another option is bifocals, but they have a sudden change in focus and an obvious line across the lens. Varifocal lenses are an increasingly popular alternative. Because they have a gradual change in their optical power, there is no jump between your near and distance vision. As a result, varifocals give you better middle distance focus as well as looking more attractive without the dividing line of bifocals."