No line bifocals, also known as progressive lenses, are multifocal lenses with no visible lines. They help you see things clearly at near, intermediate and long distances without losing quality of the vision, such as “image jump” and distortion in the cases of conventional bifocals and trifocals, and the telltale signs that immediately give away your age. Thanks to their many merits, no line bifocals are purchased and adored by many, but rarely do people look behind the surface and ask the question: how exactly does no line bifocal work. Well, today, we find out.

You see, for our eyes to accommodate from a up close vision power to a distant one, we need to make use of a special part of our eyes called crystalline lenses. To bring light from different distance into focus, the elastic crystalline lenses have to constantly change their curvature. When we were young, our crystalline lenses would have no problem in doing so. However, as we grow older, they gradually lose their elasticity and finally as we enter our 40s, we find ourselves victims to the ubiquitous presbyopia. Many people seek help from magnifying glasses. However, for those who already have a history with myopia and prescription glasses, things are different. What they are facing is far from the normal single refractive error, but rather a complicated mixture of multi refractive errors. They not only need correction for presbyopia so as to see things at a distance but also need correction for nearsightedness to see things up close. And this is where no line bifocals come in. In order to achieve multi prescription powers in the same lenses, the latest techniques in the optical industry are used to make the curvatures of every different vertical point different. This way, a smooth and gradual progression of powers from the upper parts of lenses to the bottoms is made. Light coming from different distances are bent with the help of corresponding prescription powers and thereafter brought to focus.

After a clear and detailed explain of how progressive glasses work, we are sure you are better equipped with the necessary knowledge to make your own decision as to whether or not progressive glasses are your thing. Weigh the pros and cons, and we are certain you will choose wisely for the sake of your eyes.

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