Today, the MR-174 is 80 to 90 percent biomass whose proportions are Biobased Carbon versus Fossil Based Carbon. Polycarbonate vs. Trivex Lenses: Which One to Choose Polycarbonate and Trivex Lenses are both materials for you to choose from when it comes to glasses. If ever I do end up needing glasses I will have a little more knowledge on the lenses. Luckily I’ve been wearing some comfy contact lenses since I was 11 years old, but unfortunately allergic after so many many years. Technically any lens material that has a higher index of refraction than standard plastic and glass is considered “high-index.”, RELATED: Best Anti-Fog For Your Prescription Lenses. As a result, Abbe can be made a small issue affecting lens clarity off center. Ask a Plastics Expert. Whether in the shade or for sports, leisure and entertainment, using a video display while reading or gaming contrast of objects and their background, NeoContrast lenses provide better glare management, high color contrast and sharp vision by reducing transmission of wavelengths centered at 580 nm. The thinnest edge is determined by lens shape for the frame chosen and the angle of the effective diameter (ED is twice the longest radius). This course is supported by an educational grant from MITSUI CHEMICALS INC. In 1999, MR-8 was released (Index 1.60, Sp. Mitsui Chemicals is the world’s majority producer of high-index lens monomers for the lens casters that your lab uses regularly. When we are talking about the index of lenses, we are referring to the lens material’s ability to bend light, this is referred to as the “index of refraction.”, This index of refraction is the ratio of the speed of light traveling through air, to the light traveling through the eyeglass lens material. We use our best judgment and knowledge about lenses; we consult our lab and use thinness calculators to determine which material is the best solution for a patient. But that doesn’t mean that if you don’t have a strong prescription you can’t still go with high-index lenses, these lenses will make your eyeglasses as light and comfortable as possible no matter what your prescription is. A nagging issue for higher index and premium lenses was always the reduced Abbe value, which results in a narrower field of clear view. Glad you found the information helpful to you. There is some light that is always reflected back off of the lens surface, which could cause annoying distractions, and lens flares reduce your clarity at night time. This course is approved for one (1) hour of CE credit by the American Board of Opticianry (ABO). I’d go for Polycarbonate Lenses due to its ability to protect the eyes from 100% of the harmful UV rays from the sun because I walk alot. Polycarbonate has a higher index of refraction than Trivex (1.58 vs. 1.53), so polycarbonate lenses are about 10 percent thinner than Trivex lenses. But also the lens material brand, has a strong influence on the lens quality. Those are the reflections that get in the way of seeing someone’s beautiful eyes or them seeing the entire world that’s intended through their glasses. Initial use of this very high-index material proved that the eyeglass wearing public and the ECPs who sold them appreciated the improved thinner, lighter lens opportunity. Rimless was to become very popular through the election in 2008 when consumers and news media commented on vice president candidate Sarah Palin’s Kazuo Kawasaki eyewear. Rimless eyewear needs and especially heat resistance for tinting presented a challenge that was met with MR-10 in 1998 (Index 1.67, Sp. These lenses provide you with a durable and impact-resistant lens that is perfect for anyone, but especially if you are an active individual. That was always my go to recommendation regardless of prescription, the added impact resistance is great added protection. Speaking of safety, individuals who use safety glasses or sports goggles also need to be in polycarbonate lenses due to its impact-resistant properties. Polycarbonate lenses also protect the eye from UV light. Weight. Polycarbonate is a material that is classified as a “high index” material as well due to its index of refraction. This monomer can be used to make a variety of highindex lenses. So what should we know about the modern premium high-index lens? Not so—it’s a lens index mismatch with the coating index. Remember, improving the durability of the hard coat has three main effects. Though their specific cost varies, polycarbonate lenses almost always cost more than ordinary plastic lenses. Whenever you go to purchase your prescription glasses whether it be online at the local optical retailer you are often faced with the decision on what kind of lenses you should get. There were inconsistent surface curves causing labs to have inconsistent surfacing results. In higher minus prescriptions front base curves are flatter, increasing the appearance of surface reflections and in higher plus, reflections off the back can be terribly annoying. Tinting therefore required lower bath temperatures reducing lab and especially the optical office’s efficiency. I generally recommended anyone with a prescription higher than +/-4.00 to go with a high-index lens to make their lenses are as thin as possible. First, lens scratch and abrasion resistance is improved. I’m usually faced with difficulty of making a good choice when it comes to purchasing anything both online and offline. If it is, why do they still sell poly? In addition, they were half the weight of glass lenses. These lens options usually include plastic, glass, polycarbonate, trivex, and high-index. Notice that plastic lenses have slightly steeper base curves and are still created with 2.0 mm centers. While it reflects 8.2 percent light from lens surfaces, crown glass absorbs 20 percent of UVA and 79 percent of UVB (compared with polycarbonate's 100 percent absorption of UV wavelengths, for example.) Thus, the lenses are often used in safety goggles, sports glasses and children's eyewear. Most retailers will have their high-index lenses already prepackaged with anti-reflective coating, but some you will have to purchase it separately. That means that the ultimate scratch and abrasion resistance of the anti-reflective layer becomes as hard or harder than the under layer. Keep in mind that we link these companies and their products because of their quality and not because of the commission we receive from your purchases. Even if you have a weaker prescription but you just want your glasses to be as light as possible, high-index lenses would work for you as well. Share. If you got polycarbonate and you had a higher index material previously this could be the reason why everything doesn’t seem as crystal clear. Polycarbonate lenses are also much thinner and lighter in weight. However, as you know, that is not the case. Other Concerns. Become an expert at understanding and using them. This post was most recently updated on November 7th, 2019. Any help or suggestions are greatly appreciated. This article? The de facto standard for high R.I. lens materials. The 1.61 high-index polymer single-vision lens provides a thinner lens for stronger prescriptions than mid- and standard-index optical lenses do. In addition, the 1.59 pure polycarbonate lens tends to scratch more easily than the 1.50, 1.57, and 1.53 lenses, because it’s a softer lens material. Initially used for electrical and electronic applications such as distributor and fuse boxes, polycarbonate became a popular lens option in the 1980s. However, the balance of material properties has some opticians preferring one material class over another. What’s there not to like? Opticians make this conscious choice of benefits built in when choosing lens materials for patients. They are available in photochromics and for sunwear in a polarized version, check with your lab for availability. They could be better—enter human invention. For anyone that has a prescription that is stronger than +/- 7.00 I definitely recommended going with the 1.74 high-index lens material which has the highest index of refraction to provide you with the thinnest possible lens. Polycarbonate lenses have had a long history of usage in other industries such as for the cockpits in fighter planes, space shuttle windshields, and astronaut helmet visors. Hi there, based on my newest prescription OD+1.25-0.75×95 OS+1.50-0.75X97 +1.00, would you recommended polycarbonate or high index 1.74 for my soon coming eyeglasses and would you recommended it for prescription sunglasses as well or keep the sunglasses with polycarbonate. Next, the primer layer is an impact enhancing coating layer. At the end of the day, the lens you might end up going with might be dictated ultimately by what your budget is. As the index of glass lenses goes up, weight increases, Abbe value goes down, the reflectance percentage rises, and UV absorption decreases. These new ones do not have to get polycarbonate or high-index lenses than 1.67 is dependent on prescription,. Optician ’ s certainly the case than ordinary plastic lenses about a have. That ’ s certainly the case MR-8 was released ( index 1.67, Sp they didn t. Polycarbonate within 1 week of each other budget is usually faced with of! 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