If you're middled-aged and starting to notice difficulty reading books and newspapers, you might have presbyopia, a common age-related condition that prevents you from clearly seeing close objects. But, this doesn't mean that people who already wear prescription eyeglasses to tend to their problems with nearsightedness are required to carry around two pairs of glasses and continually change them. This is because of multifocal lenses, which correct both problems, making sure you always see well.
Multifocals are a vast improvement on bifocals. Bifocals corrected problems with both near and far vision, but usually things in between were blurry. In an effort to create a better product, progressive lenses were made, which provide wearers with a transition region which lets your eyes to focus on distances that are somewhere in the middle. Progressive lenses, which are also called no-line lenses, are a type of multifocal lens that have a subtly curved lens, instead of a sharp line separating both parts of the lens. This creates not just clearer vision at near and far distances, but also good transitions in between.
However, you may take some time to adjust to these lenses. Despite the fact that the subtle transition of progressive lenses results in a product that is elegant, the lens's areas of focus are relatively small, so that there's also room for transitional areas.
Bifocals still have their uses though; they are used to treat kids and teens who experience eye strain, stemming from a struggle to focus while reading.
Although it may appear to be an easy solution, avoid buying drug store bifocals. Most of these ''ready-made'' glasses are one-size-fits-all, which means that the both lenses contain the same prescription and that the optical center of the lens is not customized for the wearer.
Glasses that aren't properly customized to you can lead to headaches, eye strain or even nausea. Unfortunately, presbyopia is a reality of our bodies' aging process. But don't forget; multifocal lenses can make all the difference.