Are you over 40 and finding it more of a challenge to read small print? You might have presbyopia, a condition that affects many of those reaching their 40s. If you already wear glasses for distance vision, and are later on diagnosed with presbyopia, you won't need to carry a separate pair of reading glasses. Multifocal lenses, which correct problems with both near and far sight, allow you to see well at all distances with one pair of glasses.
Multifocals are far superior to bifocals. Bifocals corrected poor near and far vision, but left middle vision a little blurred. In an effort to rectify this issue, progressive lenses were developed. These give you a transition region allowing your eyes to focus on distances that are somewhere in the middle. But what creates this effect? Well, progressive lenses are specially curved, unlike a bifocal lens, which is harshly divided. For this reason, progressive lenses are also called no-line lenses.
Progressive lenses may require some time to get used to. Despite the fact that the subtle lens curve results in a product that is elegant, the focal areas are quite small because more lens space is used for the transitional areas.
Bifocals still have their uses though; they are used to treat children and teens who suffer from eye strain, which is the result of a difficulty focusing while reading.
Even though it may appear to be an easy solution, it's best to steer clear of drug store bifocals. Many of these ''ready-made'' glasses are one-size-fits-all, which means that the prescription is the same in both lenses and that the optical center of the lens is not customized for the wearer.
A badly fitted pair of glasses can lead to eye strain, discomfort and even migraines. At a certain age, most people cannot avoid presbyopia. But it's comforting to know that the right lenses can make all the difference.