Description
You probably remember your grandfather wearing these. This is because these lenses correct a wider range of more severe vision issues. Bifocals and trifocals are lenses that have two and three “powers” apiece, respectively.
They are sometimes referred to as “multifocals” even though this technically refers to progressive lenses.
All within one lens, you have separate sections for near and distance correction, which makes them a versatile choice. Those requiring intermediate vision correction will be prescribed with trifocals that have a third correction too.
The drawback of bifocals and trifocals is that there are lines separating each section, which makes for drastic changes in vision correction when you move your eye inside the lens. It’s something that you learn to work with, but the inconvenience paved the way for advances in lens technology such as progressives.
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