Progressive lenses are no-line multifocal eyeglass lenses that look exactly the same as single vision lenses. In other words, progressive lenses will help you see clearly at all distances without those annoying (and age-defying) “bifocal lines” that are visible in regular bifocals and trifocals. The power of progressive lenses changes gradually from point to point on the lens surface, providing the correct lens power for seeing objects clearly at virtually any distance. Bifocals, on the other hand, have only two lens powers — one for seeing distant objects clearly and a second power in the lower half of the lens for seeing clearly at a specified reading distance. The junction between these distinctly different power zones is defined by a visible “bifocal line” that cuts across the center of the lens. Progressive lenses sometimes are called “no-line bifocals” because they don’t have this visible bifocal line. But progressive lenses have a significantly more advanced multifocal design than bifocals or trifocals.
Most people start needing multifocal eyeglasses sometime after age 40. This is when a normal aging change in the eye called presbyopia reduces our ability to see clearly up close. For anyone with presbyopia, progressive lenses have significant visual and cosmetic benefits compared with traditional bifocals and trifocals. As already mentioned, bifocals have just two powers - one (in the top half of the lens) for distance vision, and a second (in the lower half of the lens) for near vision. Basically, this zone for near vision is the combination of the lens prescription for distance vision plus an added amount of magnifying power to help you see small print and near objects more clearly. This additional magnifying power is called the near “add” of the bifocal prescription. Typically, it’s the added power required to enable you to see clearly at a normal reading distance of about 16 inches from your eyes. Trifocals go one step further - they have a third power for seeing objects clearly at arm’s length. This “intermediate” power of a trifocal lens is located in a thin horizontal zone between the distance and near power zones. Progressive lenses, on the other hand, have many more lens powers than bifocals or trifocals, and there’s a gradual change in power from point to point across the surface of the lens.
Ready to start seeing better? Schedule your eye exam appointment with our friendly optometrists at (301)871-6454 or come in with your prescription to be fitted with progressive lenses at 13808 Georgia Ave, Silver Spring, MD 20906