Anti-reflective coating is also called anti-glare glasses, no-glare coating, and anti-reflective glasses, and it refers to a series of layers that is adhered to the back and front surface of prescription lenses, or just the back of the lens if the lens is polarized. The purpose of anti-glare glasses is to help reduce the amount of reflections on the lens. Consisting of metal oxides, each layer is a thin film that is designed to block a specific wavelength of light. The more layers of film, the more wavelengths that are blocked. AR coating causes the light that reflects from the inner and outer surfaces of each film layer to become equal, thereby canceling each other out.

Opticalmeaning in computer

Well, the clock has turned and anti-reflective coating is now completely reliable, whether you choose the more expensive Crizal anti reflective coating, or the less expensive anti reflection coatings that are available. Yes, if you leave your anti glare glasses on the dashboard of your car in Florida, the anti-reflective coating could show signs of stress, but this falls in the category of abuse. No-glare coating does cost an additional $20 to $90 depending on the underlying lens, but there are significant benefits to anti-reflective coating. Whether it is right for you - if it is worth the extra cost - is your decision. Your no glare glasses will work fine without anti-reflective coating, but the relaxation to your eyes and improved vision are usually worth it.

Opticalmeaning in bengali

Through the principle of total internal reflection, light rays beamed into the optical fibers can propagate within the core for great distances with exceptionally concise attenuation or reduction in intensity, making fiber optics the ideal method for transmitting data over long distances.

Optician meaning

Fiber optics telecommunication uses infrared light in the wavelength ranges of 0.8–0.9 μm or 1.3–1.6 μm - wavelengths, efficiently generated by light-emitting diodes or semiconductor lasers and that suffer minimum attenuation in glass fibers.

Eyeglasses.com offers three basic types of coatings. On our least expensive lenses and within a restricted prescription range, anti-reflective AR coatings are an extra $20. This is possible because the lenses are coated in a mass production of tens of thousands of lenses. On other lenses that are custom made, we offer a $59 anti-reflective AR coating which is an excellent coating. However, it is not quite as good at the premium Crizal AR coatings offered by Essilor.

Anti-reflective coating allows 8% more light to enter the eye. That 8% of light was bouncing off the outside of the lens, causing other people to see a shiny spot on your glasses and preventing them from seeing your eyes. Also, when a light source is overhead or behind you (as is often the case), light reflects off the inside of your lens and bounces into your eye, increasing eye fatigue.

Opticalmeaning in Hindi

- Without anti-reflective AR coating, reflections on the lenses will prevent people from seeing your eyes. Actors, newscasters, and businessmen prefer AR so that their audience and associates can clearly see their eyes.

Opticalmeaning in Tamil

The basic medium of fiber optics is a hair-thin fiber that is sometimes made of plastic but most often of glass. A typical glass optical fiber has a diameter of 125 micrometres (μm), or 0.125 mm (0.005 inch). This is actually the diameter of the cladding, or outer reflecting layer. The core, or inner transmitting cylinder, may have a diameter as small as 10 μm. Through a process known as total internal reflection, light rays beamed into the fiber can propagate within the core for great distances with remarkably little attenuation, or reduction in intensity. The degree of attenuation over distance varies according to the wavelength of the light and to the composition of the fiber.

Author of this article:  Mark Agnew CEO of Eyeglasses.com, which he founded in 1999.  For over twenty years, he has educated consumers, improved their vision choices, and reduced costs in eyewear.  Mark authored The Eyeglasses Buying Guide, the most comprehensive and best-selling glasses buying guide in the world. Bio     LinkedIn     Blog     Facebook

Opticalmeaning in Urdu

In telecommunications, optical fibers have been used to replace copper wire in long-distance telephone lines and for linking computers within local area networks. Fiber optics is also the basis of the fiberscopes used for endoscopy or inspecting the interiors of manufactured structural products.

Do you remember back in the 1990's when anti-glare coating regularly flaked, stained, and got psychedelic colors? It was a nightmare for opticians because customers got angry and would blame them for selling an expensive coating that did not perform well.

Fiber optics, also spelled fibre optics, is the science of transmitting data, voice, and images by the passage of light through thin, transparent fibers.

- Anti-reflective AR coating on the back side of sunglass lenses eliminate some problems. First is the annoying image of the eye that is reflected in the center of the lens and can be very distracting. Second is the glare hazard that is caused by the mirror effect of a dark lens. With sunglass lenses, light from behind the wearer can be reflected directly into the eye from the back of the lens surface, causing discomfort.

The optical fibers used in fiber optics are sometimes made of plastic but most often are made of glass. A typical glass optical fiber has a diameter of 125 micrometers (μm) or 0.125 mm (0.005 inches). Plastic fibers are made of polymethylmethacrylate, polystyrene, or polycarbonate. These are cheaper to produce and more flexible than glass fibers, but their attenuation of light restricts their use to shorter links.

Define opticalin medical terms

When there is more available light to your eye, you can see better and more clearly. The result is a clearer, sharper vision and reduced eyestrain, which would benefit everyone. However in some situations, the benefits are more noticeable:

Define opticalin science

Crizal is the best known anti-reflective coating on the market, and also the best and the most expensive. Before you choose Crizal, think carefully about whether you even need or want anti-reflective coating on your glasses. Anti-reflective AR coating is chosen by 28.5% of eyewear shoppers in the United States, compared to 50-90% in Europe. There are many reasons that could contribute to this gap, but the primary reason is probably the bad history that anti-reflective AR coating had in its early years. In the 80's and 90's, anti-reflective AR coatings had a single layer which would craze, scratch or smudge easily. Today's AR coatings includes a harder layer of scratch resistant coating, in addition to oleophobic (anti-oil), hydrophobic (anti-liquid), and anti-static layers. These extra layers help to repel the things that lead to smudging and scratching. They also help to make the lenses easier to clean and thereby reduce surface scratches from excessive cleaning.

When glass fibers of core/cladding design were introduced in the early 1950s, the presence of impurities restricted their employment to the short lengths sufficient for endoscopy. In 1966, electrical engineers Charles Kao and George Hockham, working in England, suggested using fibers for telecommunication, and within two decades silica glass fibers were being produced with sufficient purity that infrared light signals could travel through them for 100 km (60 miles) or more without having to be boosted by repeaters. In 2009 Kao was awarded the Nobel Prize in Physics for his work. Plastic fibers, usually made of polymethylmethacrylate, polystyrene, or polycarbonate, are cheaper to produce and more flexible than glass fibers, but their greater attenuation of light restricts their use to much shorter links within buildings or automobiles.

Optical telecommunication is usually conducted with infrared light in the wavelength ranges of 0.8–0.9 μm or 1.3–1.6 μm—wavelengths that are efficiently generated by light-emitting diodes or semiconductor lasers and that suffer least attenuation in glass fibers. Fiberscope inspection in endoscopy or industry is conducted in the visible wavelengths, one bundle of fibers being used to illuminate the examined area with light and another bundle serving as an elongated lens for transmitting the image to the human eye or a video camera.

- Fluorescent lighting, computer screens, cash registers etc. all cause an increase of reflections in the workplace. This increase in reflections causes eye straing, headaches, fatigue and a decrease in work productivity.

fiber optics, the science of transmitting data, voice, and images by the passage of light through thin, transparent fibers. In telecommunications, fiber optic technology has virtually replaced copper wire in long-distance telephone lines, and it is used to link computers within local area networks. Fiber optics is also the basis of the fiberscopes used in examining internal parts of the body (endoscopy) or inspecting the interiors of manufactured structural products.

- External reflections are a major problem when it comes to driving safely at night. The reflections from oncoming headlights, streetlamps, and the road can cause distractions and discomfort to the driver. Internal reflections can cause ghost images and result in a decrease in reaction time.

Anti-reflective AR coatings always work better when they are made by the same maker as the lens itself. For example, Zeiss anti-reflective coating works best on Zeiss lenses, Pentax anti-reflective coating works best on Pentax lenses, and Crizal no glare coatings work best on Essilor and Varilux lenses. The reason for this is that the manufacturers each have their own formula for the underlying lens. That formula bonds best to an anti-reflective AR coating that is of the same chemical family. Premium anti-reflective coatings are actually bonded to the lens surface, becoming one with the lens.