Are you having trouble reading small print? If you're close to middle-age, you might have presbyopia. If you're already a glasses wearer, and are later on diagnosed with presbyopia, you won't have to start carrying and switching between two pairs of glasses. This is all thanks to multifocal lenses, which can take care of both problems, making sure you always see clearly.
Before mulifocals, bifocals were the popular fix, but they weren't all that great; even though they correct problems with both near and distant objects, everything in between is blurred. To create a better product, progressive lenses were developed. These give you a transition part of the lens 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 made with a gradual curvature across the lens surface instead of a sharp line distinguishing the two parts of the lens. This creates not just clearer vision at near and far distances, but also nice, comfortable transitions between the two.
Progressive lenses, although better, may take some time to get used to. While the gentle transition of progressive lenses is more aesthetically pleasing, the focal areas are quite small because more lens space is used for the transitional areas.
While these days, these progressive lenses (or trifocals) are for presbyopia, bifocals are still employed to aid young patients with issues like eye teaming, or being unable to focus while reading, which causes headaches.
Multifocal lenses are most helpful when they're customized to your specific needs. When you're ready to get yours, enlist the services of a professional you feel comfortable with.
If your prescription or fit is off you could end up suffering from eye strain, discomfort and even migraines. At a certain age, most people cannot dodge presbyopia. But it's important to know that good, multifocal lenses can make it a lot easier.