Presbyopia, or far-sightedness, is a common condition that often begins to affect those over the age of 40. If you already wear glasses for distance vision, and are later on diagnosed with presbyopia, you don't have to start carrying and switching between two pairs of glasses. Multifocal lenses, which correct problems with both near and far sight, help you see clearly at all times, with one pair of glasses.
Multifocals are a vast improvement on bifocals. Bifocals did correct problems with both near and far vision, but often objects in between were blurry. In an effort to fix this issue, progressive lenses were developed, which offer and intermediate or transition region allowing your eyes to focus on distances that are in the middle. Progressive lenses, which are also known as no-line lenses, are a type of multifocal lens featuring a gently curved lens, rather than a sharp line distinguishing the two areas of the lens. This creates not just clearer vision at all distances, but also good transitions between the two.
Progressive lenses can require some time to adjust to. Even though the subtle transition of progressive lenses is more elegant, the lens's areas of focus are relatively small, because they all need to fit.
Bifocals are still used though; they are helpful for kids and teenagers who suffer from eye strain, which is the result of a difficulty focusing while reading.
It's also important that you get professionally fitted, and not resort to drugstore bifocals. A lot of these ''ready-made'' glasses are one-size-fits-all, which means that the both lenses contain the same prescription and are not customized for the wearer.
Glasses that aren't properly customized to you can lead to eye strain, discomfort and headaches. At a certain age, most of us cannot dodge presbyopia. But it's good to know that the right lenses can enrich your vision, and your life.