If you are around the age of 40 and starting to observe some difficulty reading small print, you may have developed presbyopia, a common age-related condition that makes it challenging to focus on close objects. Fortunately, this doesn't mean that people who already have glasses to tend to their problems with nearsightedness are required to own two pairs of glasses. This is all thanks to multifocal lenses, which help you with both problems, making sure you always see clearly.
Before mulifocals, bifocals were the popular fix, but they weren't perfect; while they help you to focus on both near and distant objects, everything in between is blurred. To create something more helpful, progressive lenses were made. These offer a transition part of the lens allowing you focus on distances that are somewhere in the middle. Progressive or no-line lenses are a type of multifocal lens that have a gradual curvature across the lens, rather than a sharp line dividing the two areas of the lens.
However, it can take a bit of time to adjust to no-line lenses. Despite the fact that the gentle transition of progressive lenses results in a product that is aesthetically pleasing, the focal areas are quite small because more lens space is used for the transitional areas.
Bifocals still have their uses though; they are helpful for kids and teens who experience eye strain, which is the result of a struggle to focus while reading.
It's also crucial to get fitted properly, and avoid store-bought bifocals. A lot of these types of glasses have the same prescription in both lenses, which will not help a lot of people.
Having an incorrect prescription can leave you with headaches, eye strain or even nausea. At a certain age, most of us will not be able to avoid presbyopia. But it's good to know that the right lenses can make it a lot easier.