If you live in a cold climate, nothing is more frustrating than having your eyeglasses fog up when you come in from the cold. This also can be a safety issue, since it limits your ability to see for several minutes until the fog clears. Lens fogging can be especially dangerous for police officers and other first responders to emergency situations. At least one eyeglass lens coating company (Opticote, Inc., Franklin Park, Ill.) has created a coating designed to eliminate this problem. Its thermally cured coating — called Fog Free — eliminates the condensation of moisture on lenses that causes fogging, keeping your lenses and vision clear when you make the transition from a cold environment to a warm one. It may also keep your lenses from fogging up during sports and other times you are hot and perspiring. Fog Free can be applied to plastic, polycarbonate and other eyeglass lenses, including high-index lenses and Transitions photochromic lenses. The anti-fog coating is applied to the lenses before they are cut to fit into your frame at the optical lab. Ask your optical retailer about pricing and availability.
Progressive lenses also provide a more natural correction of presbyopia than bifocal or trifocal prescription eyeglasses. Instead of providing just two or three lens powers like bifocals or trifocals, progressive lenses are true “multifocal” lenses that provide a seamless progression of many lens powers for all viewing distances. With progressive lenses, you can look up to see clearly across the room and in the distance. You can also look ahead to view your computer in the intermediate zone and drop your gaze downward to read and do fine work comfortably. And it’s easy to adapt to today’s modern progressive lenses.
A “corridor” of optimum vision runs vertically down each progressive lens. Your eye care practitioner will take careful measurements of your eyes and eyeglass frame in order to place the corridor in just the right location so your eyes can naturally access the various powers within the lens for comfortable viewing at all distances.
And progressive lenses eliminate an annoying problem caused by bifocal and trifocal lenses known as “image jump.” With conventional bifocals and trifocals, images seem to “jump” as your eyes move past the sharply defined boundary between the distance and near parts of the lens. With progressive lenses, the transition between lens powers within the lens is smooth and seamless, letting you change focus from distance to near and back again more comfortably.