One of the most popular words that customers search for on our website is "bifocals". Usually, the product they are looking for is what we refer to as a "clear bifocal", meaning no magnification on top, with the reader part on the bottom. It's important to distinguish "clear bifocal" from "sun bifocals" which are tinted. The two main reason people wear bifocals are convenience and style. They're convenient because you don't have to take off, put on, take off your readers all day. Unless you're reading for long uninterrupted periods, most people experience this. Style comes into play because most people prefer the "look" of regular eyeglasses. Bifocals combine the function of a half-eye with the style of a full frame.
Sun bifocal readers, as the name clarifies, are for the great outdoors. They're great for driving, reading, or walking around with. It is important that the bifocal doesn't interfere with your line of vision, otherwise they can be dangerous when walking or driving. Variations of sun bifocals include anti-glare, no-line, and polarized (which tend to be more expensive).
Did you ever notice that the glasses you use for reading books, newspapers, and price tags are not optimal for viewing your computer monitor or device? This is where dual strength bifocals and multi focals come into play. While reading close up is considered "near" vision, your device is usually positioned in the "intermediate" range. This actually requires a LOWER strength. (To understand the biophysics behind this, check out our focal point blog). Dual strength bifocal and trifocals are magnified on the bottom and the top. The top part is weaker, to accommodate for intermediate distances.
Some common questions about bifocals are:
Q:Do the bifocals go straight across the lens?
A: No. almost all ready to wear bifocal reading glasses as of 2017 have the reader located closer to the center, and in the lower third of the lens. This is a generalization, and it does depend on the style. The reason is cost. "Executive" cut bifocals are much more expensive and rarely used in mass production. Because the eyes converge, or come together, when reading, the common positioning suits most people. It further interferes less when looking distances.
A:Progressive is one style of "no-line" bifocals, when you can't see the bifocal line. New technology has enabled no-line, or virtually no-line, by placing the bifocal on the inside of the lens, and "blending" it so the demarcation from bifocal to lens isn't so severe. Technically speaking, it's not progressive. Though our multi focals ARE progressive, the others that we sell are not. True progressives are very expensive (starting at $100) and at that price, there's a very blurry transition. High end progressives are even more expensive. In essence the new blended bifocal technology work way better than true progressives, and for a heck of a lot less money. As for the progressive multi focals, even we cannot grasp how they manufactured such an incredible, high quality lens that retails for under $30, but we are impressed.
Not ALL of our bifocals are no-line. That information will be in the product description.