Many people start to have problems with close vision during their 40s. This is known as presbyopia. If you already struggle with distance vision, and develop presbyopia, you won't need to start carrying and switching between two pairs of eyeglasses. This is because of multifocal lenses, which help you with both problems, ensuring that you always see clearly.
Multifocals are far superior to bifocals. Bifocals did correct poor near and far vision, but left everything in between a little blurred. To create something better, progressive lenses were invented. These offer and intermediate or transition region that allows your eyes to focus on the area between things like the books you read and street signs. Progressive or no-line lenses are a type of multifocal lens that have a subtle curvature across the lens surface rather than an obvious and harsh line distinguishing the two parts of the lens. This provides not just clearer vision at all distances, but also nice, comfortable transitions between the two.
These lenses, although better, may require some time to adjust to. Despite the fact that the subtle transition of progressive lenses results in a product that is elegant, the lens's areas of focus are small, so that there's also room for transitional areas.
Bifocals aren't entirely dated though; they are helpful for children and teenagers who have a hard time focusing when reading.
When the time comes to get fitted for multifocal lenses, make sure it's with an eye care professional you trust. Multifocal lenses are most beneficial when properly fitted to your eyes, prescription and line of vision.
If you've been fitted with an incorrect prescription you could end up suffering from eye strain, discomfort and even migraines. Unfortunately, presbyopia is just a part of aging. But keep in mind that multifocal lenses can make all the difference.