Have you started to have difficulty when reading fine print? If you're close to middle-age, you might have presbyopia. If you're already a glasses wearer, and develop presbyopia, you don't have to carry a separate pair of reading glasses. Multifocal lenses, which correct both myopia and presbyopia, let you see clearly at all distances with one pair of glasses.
Multifocals are much better than bifocals. Bifocals did correct problems with both near and far vision, but usually things in between were blurry. In an effort to correct this issue, progressive lenses were invented. These offer a transition region which lets you focus on everything between things like the books you read and far objects like road signs. Progressive or no-line lenses are a type of multifocal lens featuring a subtle curvature across the lens, instead of an obvious and harsh line distinguishing the two areas of the lens. This creates not just clearer vision at all distances, but also good transitions in between.
These lenses may require a small period of time to adjust to. While the subtle transition of progressive lenses results in a product that is aesthetically pleasing, the lens's areas of focus are relatively small, because they all need to fit.
Even though these progressive lenses (or trifocals) are for presbyopia, bifocals are still used to help school-aged children and teens who experience issues such as eye teaming, or being unable to focus while reading, which in turn, can lead to eye strain.
When being fitted for multifocal lenses, it's important that you're attended to by an eye care professional you trust. Multifocal lenses are most beneficial when properly fitted to your eyes, prescription and line of vision.
A badly fitted pair of glasses can lead to headaches, eye strain or even nausea. Unfortunately, presbyopia is a reality of our bodies' aging process. But keep in mind that multifocal lenses can make all the difference.