If you're middled-aged and beginning to observe some difficulty reading fine print, you may have developed presbyopia, a common age-related condition that prevents you from clearly seeing near objects. Fortunately, this doesn't mean that people who already have glasses to tend to their problems with distance vision need to own two pairs of glasses. Multifocal lenses, which correct both myopia and presbyopia, let you see well at all times, with one pair of glasses.
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 fix this issue, progressive lenses were invented, which offer a transition region which lets you focus on distances that are in the middle. How does this work? Progressive lenses feature a gradual curvature, unlike a bifocal lens, which is harshly divided. Because of this, progressive lenses are also known as no-line lenses.
But, it can take some time to get used to these lenses. While the subtle transition of progressive lenses results in a product that is aesthetically pleasing, the lens's areas of focus are small, so they they're all able to fit.
While these days, these progressive lenses (also called trifocals) are for presbyopia, bifocals are often used to help young patients with issues such as eye teaming, or being unable to focus while reading, which causes headaches.
It's also important that you get fitted properly, and not turn to store-bought bifocals. Most of these types of glasses have the same prescription in both lenses, which will not help a lot of people.
Having a wrong prescription can leave you with eye strain, discomfort and even migraines. Unfortunately, presbyopia is a reality of our bodies' aging process. But keep in mind that multifocal lenses can make all the difference.