BSL Physics Glossary - eyepiece lens - definition - eyepiece lens
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A number of companies make anti-fog sprays and coatings designed to reduce the condensation of moisture on lenses that causes fogging. So, your lenses and vision stay clear when you make the transition from a cold environment to a warm one.
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 until the fog clears.
AR coating is highly recommended for all eyeglass lenses, but particularly for polycarbonate and high-index lenses, which reflect more light than regular glass or plastic lenses if anti-reflective coating is not applied.
The use of thermal barriers in aluminum-framed windows vastly improves insulating ability. Polyurethane is placed between the frame to create a thermal barrier and reduce the flow of heat, making the A250 Thermally Improved Aluminum windows more energy efficient.
Thanks to their rigidity and durability, the A250 windows can be configured into combinations with a large glazing area for maximum views. What’s more, they beautifully accentuate the clean, thin lines of contemporary design.
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Also, be wary of products that promise to repair scratched lenses. These products may fill in the scratches, but it is impossible for them to make the scratches disappear, so the lenses look new again.
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For the best possible comfort in all lighting conditions, eye care professionals usually recommend applying anti-reflective coating to photochromic lenses. AR coating improves light transmission through the lenses for night driving and helps photochromic lenses reduce glare in bright sunlight.
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By doing so, AR coating makes your lenses nearly invisible so people can focus on your eyes, not distracting reflections from your eyeglasses.
Anti-fog coatings can be applied to plastic, polycarbonate and other eyeglass lenses, including high-index lenses and Transitions photochromic lenses. The 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.
A250 windows offer narrow sightlines, energy efficiency, and durability. Designed for replacement and new construction applications, the A250 has the style and functionality you’ve been searching for.
Lens fogging is caused by tiny water droplets that form by condensation on the surface of eyeglass lenses when the lenses are significantly cooler than the surrounding air temperature.
With clean lines and narrow frames, these aluminum windows are the perfect complement to achieve contemporary design and enhance a modern architectural style. They’re also great for retrofit or new construction.
Also, aspheric lenses, which have flatter curves than regular lenses, often cause more noticeable reflections, so AR coating is highly recommended for these lenses, too. And AR coating is beneficial when applied to the back surface of sunglasses to eliminate "bounce-back" reflections when you are facing away from the sun.
Since scratch-resistant coatings are sometimes optional, make sure your optician knows that you want your eyeglass lenses to include hard coating for extra durability. Also, ask about the warranty on eyeglass lenses that are treated with scratch-resistant coating versus those without the coating.
Anti-fog coating also may keep your lenses from fogging up during sports and other times when you are hot and perspiring.
Anti-reflective coating also eliminates glare caused by light reflecting from your lenses. With reflections eliminated, lenses with AR coating provide better vision for night driving and more comfortable vision for reading and computer use.
Another beneficial lens treatment is an invisible dye that blocks ultraviolet (UV) light. Just as sunscreen keeps the sun's UV rays from harming your skin, UV-protective treatments for eyeglass lenses block those same rays from damaging your eyes.
Lens coatings can enhance the durability, performance and appearance of your eyeglass lenses. This is true whether you wear single vision, bifocal or progressive lenses.
Regular plastic eyeglass lenses block most UV light, but adding a UV-blocking dye boosts UV protection to 100 percent for added safety. Other eyeglass lens materials, including polycarbonate and most high-index plastics, have 100 percent UV protection built-in, so an extra lens treatment is not required for these lenses.
The rollers, locks, frame members, and hardware are designed to keep the A250 windows in the forefront of appearance and security. These handcrafted components contribute to the overall strength and durability that aluminum windows are known for.
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Keep in mind that even the best scratch-resistant coating can't completely protect your lenses from wear and tear. To keep your glasses looking new, store them in a cushioned case when not in use, and clean your lenses with a microfiber cloth and the cleaning solution your optician recommends.
Today, most eyeglass lenses, including high-index lenses and lenses made of polycarbonate and Trivex, have a built-in scratch-resistant coating.
However, lenses that are treated front and back with a clear, scratch-resistant coating have a much harder surface that is more resistant to scratching, whether from dropping your glasses on the floor or occasionally cleaning them with a paper towel.
Anti-reflective coating (also called AR coating or anti-glare coating) is a microscopically thin multilayer coating that eliminates reflections from the front and back surface of eyeglass lenses.
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