It is widely known that polycarbonate lenses are much lighter and thinner than regular plastics. High index lenses refer to one of several different kinds of plastic lens material. They can resist acetone, which few plastics can resist, including polycarbonate. High Index lenses are thinner, stronger, and more versatile than standard eyewear lenses.They are made from extremely durable plastic and are regarded as the best lenses you can get for your prescription glasses. Like Perfect-Eyeglasses-Guide.com on Facebook. If you are interested in impact resistant high index lenses, here are some useful things to know: If you are most concerned with keeping your eyes safe from impact, you should definitely purchase a pair of prescription glasses with polycarbonate lenses. Are High Index Lenses Also Impact Resistant? They have a refractive index of 1.586 and due to its impact resistant quality are used primarily for children’s eyewear, safety glasses, and sports eyewear. However, labs would generally surface this material down to 1.5 mm and then perhaps add an AR coating to it. If you have the knowledge or experience that others would want, you can do the same and create a website from scratch about your hobby, using the right tools. Required fields are marked *. Polycarbonate is a good choice for impact resistance if your prescription is not very high, or if you need. That … Conversely, polycarbonate, one of the lowest-index lenses, is extremely impact resistant and flexible but very soft and easy to scratch. Unless these material can all withstand the force of the impact, … Polycarbonate lenses are also much thinner and lighter in weight. Of course, this means that both require a scratch resistant coating, but with this coating, … Eyeglass lenses made of polycarbonate were introduced in the early 1980s in response to a demand for lightweight, impact-resistant lenses. Impact resistant lenses are manufactured using an injection molding process which makes them stronger than standard lens materials. Mid-index lenses, such as 1.54, 1.56, and 1.57, are thinner than glass, and nearly as strong as CR-39. The difference between your glasses' lens index can make a huge impact. How thick would plastic lenses be on a round size 48 frame? It is also not easily scratched. A high-index eyeglass lens allows people with a stronger prescription to wear a lens that is lightweight and thin. Some stronger prescriptions require even high index lenses to be thick enough that they would pass ANSI’s standard impact resistance test, though it is impossible to find a pair of high index prescription glasses that pass ANSI’s “high impact resistance” test. Polycarbonate High Index is the most impact-resistant lens material that most labs offer, and it is not considered to be high index (though its index is higher than standard plastic). High-index eyeglass lenses are the right choice if you want thinner, lighter lenses and eyeglasses that are as attractive and comfortable as possible.. Thinner, lighter high-index lenses are especially recommended if you have a strong eyeglass prescription for nearsightedness, farsightedness or astigmatism. As well as their similar weight and thickness, both lenses provide comparable impact resistance. They are impact resistant, scratch resistant and UV coated. This material is so tough and shatter resistant that it is also used to manufacture airplane windows. Polycarbonate lenses are made of a type of plastic that is more impact-resistant than standard plastic lenses. And most of all, it gets thick quickl… Acetone is a common chemical in nail polish removers and some other solvents that may be around your house. Essilor offers hi-index 1.67, 1.6, and 1.74 lenses that are thinner and lighter with more appealing aesthetics for greater comfort and a better look. The combination of a thinner center and a brittle AR coating might drop the … Because they are typically processed to be as thin as possible, and because high index is a plastic that will crack when enough force is applied, many pairs of high index prescription lenses would fail an impact resistance test. High index lenses are more scratch-resistant than polycarbonate, so if you’re looking for lens longevity as opposed to impact resistance, high index plastic is still probably the best choice. Glass lenses, plastic lenses, or laminated glass lenses can be made impact resistant … Your email address will not be published. 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. Learn more about how Polycarbonate lenses or impact-resistant lenses are up to 10 times more impact resistant than regular plastic lenses. There are no scratches, Q: 1. How? Compared with polycarbonate lenses, Trivex® is a premium material that provides crisper vision and is 10% lighter. It does not contain the impact resistant qualities of polycarbonate. 1. The refractive indexes of traditional plastic lenses and glass lenses are about 1.5 and 1.52 respectively. They are also very resistant to unusual problems, like several chemicals. Their strength and impact resistance makes them a great option for kids’, rimless frames, sports goggles and safety glasses, or anyone who is rough on their glasses. If you have the knowledge or experience that others would want, you can do the same and create a website from scratch about your hobby, using the right tools. If you are most interested in a pair of good-looking glasses that will last a long time, high index plastic is the material for you. Copyright © 2020 Perfect-Eyeglasses-Guide.Com. Because they are typically processed to be as thin as possible, and because high index is a plastic that will crack when enough force is applied, many pairs of high index prescription lenses would fail an impact resistance test. High-index plastic is available with the following indexes of refraction: 1.54, 1.55, 1.56, 1.6, and 1.66. The lenses are a high-index plastic material. Learn more about how Polycarbonate lenses or impact-resistant lenses are up to 10 times more impact resistant than regular plastic lenses. They’re also ideal for strong prescriptions since they do not add thickness when correcting vision, minimizing any distortion. High Index Lenses Of course, high index lenses are in a separate category precisely because their refractive index is far above the rest. A comparison between polycarbonate and high-index lenses. Lenses made from Trivex are extremely resistant to common problems like being dropped or scratched. The impact resistance of both materials can be attributed to their ‘softness’ compared to other high impact lenses. (Ames, Iowa). Save my name, email, and website in this browser for the next time I comment. The 1.53 mid-index Trivex lens is a polymer lens that is the most impact-resistant lens available. High-index lenses have an index of refraction that starts at around 1.61 and can go as high as 1.74. Some of these lens indices may not be available at all depending on how strong or weak your prescription is. It's easy to do. Polycarbonate Lenses are ideal for rimless frames or anyone using their glasses for sporting activities. How to Choose the Right Glasses Lens Differences among different lens indexes can generate great impacts. Polycarbonate lenses also have built-in ultraviolet protection. Impact-resistant lenses reduce the number of eye injuries from eyeglasses and sunglasses. It is also worth noting that you do not want to have any issues with OSHA should they visit a job site while you’re wearing questionably suited glasses for your work. If you are interested in prescription safety glasses in a wraparound frame, you may not be able to get the lenses in high index plastic anyway because larger wraparound frames often have large lens pockets that will not work with many prescriptions in high index plastic. If your lenses are thick enough to have standard (safety) impact resistance, you may be able to have your optical provider supply you with a Z87 stamp, certifying them as safety glasses (as long as the frame they’re in is also safety). Most high index scratch-resistant lenses are 50 percent lighter than CR-39 plastic lenses. High index lenses are the thinnest lenses for stronger prescriptions. All rights reserved. The glasses I'm using currently are hi-index plastic and while it's ok, it doesn't feel, Q: Please help. This ensures more comfortable glasses even if your farsightedness, nearsightedness, or astigmatism prescription is high. If you choose a high index lens, all of it will be thinner at the center and edge, so more sensitive to scratches and breaking. In terms of balancing price … It covers the same range as the 1.57 mid-index lens: -4.00/+2.00 or lower on the SPH and +/- 6.00 or lower on the CYL. Their key benefits include lighter weights and much thinner lens construction which improves fit and clarity. Your email address will not be published. Deciding which you should get depends on your prescription and your lifestyle. Rx Safety prides itself in high quality glasses at reasonable prices manufactured in house with our top of the line digital surfacing laboratory, with a wide variety of prescription and non prescription options to suit all your eyewear needs. We hope to be helpful for you! They are considered a high index plastic. Prescription lenses all have a definite "index", which ranges from 1.56 to 1.74. © RX Safety - Developed by ISEA Media & Cosmick Technologies. Thinner lenses are lightweight (and more stylish!) This will come down to personal preference, but they can be game-changers for people used to thick, heavy lenses. Hi-index plastic is lightweight and thinner than most plastic. Trivex® lenses are impact resistant and more lightweight than standard lenses. High-impact resistant polycarbonate lenses are ideal for: Children; Athletes; People with mild to moderate prescriptions; Rimless and semi-rimless frames; Our polycarbonate lenses include polished edges as well as scratch-resistant and UV-protection coatings. For strong prescription, the higher the index, the thinner the lens; for weak prescriptions, a low index lens will be no thicker than high index eyeglass lenses. If you are working at a job that requires safety glasses, it is a good idea to check with a safety officer to see what’s accepted where you work before purchasing any glasses. All high-index lenses sold on Eyeconic.com are scratch and impact resistant. It is lighter and more scratch resistant and has high-impact resistance like Polycarbonate. It is important to consider the fact that, in a dangerous environment, it is a poor decision to trade safety for aesthetics. Polycarbonate 1.59 index lenses are a thin and lightweight material, that is very resistant to impacts. Any lens material with a refractive index higher than these numbers are considered a highly index lens material. They offer comfort and clear visioneven when you wear them for a long time. Rx-Safety.com is a family-owned and – run optical lab and online store. The power and base curve of the lens will also affect its impact resistance. Q: I've worn polycarbonate lenses for many years because of a strong prescription (-6.5/ -7.5). The higher the number, the thinner and lighter the lens. When a worker falls, their body harness, lifeline, self-retracting lanyard, and anchor are all subjected to a high impact. The high index does not provide additional impact resistance, it depends only on the material. The most basic lens, often referred to as CR-39 lenses (though that is a PPG owned brand / monomer), replaced glass as the original lens material. Thinner and lighter than plastic, polycarbonate (impact-resistant) lenses are shatter-proof and provide 100% UV protection, making them the optimal choice for kids and active adults. These lenses are perfect for anyone with stronger prescriptions, but not only limited to just those individuals. Their refractive index rises above 1.59 and can range from 1.60 to 1.74. High-index lenses have a low Abbe value, which means they disperse more light than traditional lenses. and can accommodate MANY kinds of vision needs, including higher prescriptions. High Index Lenses . Join in and write your own page! Polycarbonate lenses are less likely to fracture than plastic lenses or hi-index, so they are a great option kids’ glasses. MR™ Series is especially suitable for ophthalmic lenses and is known as the first thiourethane based high index lens material. This website is created for a purpose, we want to help as many people as possible, to make an informed choice when shopping for glasses. How? Trivex is an improvement over Polycarbonate. Got a new pair of glasses with bifocals and noticed that the left bifocal is slightly tilted and at a different height than the right. Impact resistance is an important consideration for fall protection equipment. Q: I want to get plastic lenses because of the high abbe value. Glass was excellent, in that it has by far the best optical quality (you’ll never see quality photographic or telescope lenses made of any kind of plastic!). Hi, I'm Endre with my brother Arpi. And remember – better safe than sorry! Trivex lenses are the new rival for polycarbonate lense; they are thin, lightweight and much more impact-resistant than regular Plastic CR-39 or Polycarbonate lenses. Trivex lenses have crisper optics, and may have sharper central vision than Polycarbonate lenses. This softness means both Trivex and polycarbonate can absorb impact rather than fracturing. They can sharpen your sight even further if you apply an anti-glare coati… Some people with strong prescriptions also need safety eye-wear or are interested in getting lenses that are impact resistant to protect their eyes better during work or hobbies. These lenses are 8% to 25% lighter and thinner than CR-39 (normal plastic), depending on the prescription. The lower numbers are classified as mid-index lenses. California Prop 65 Warning » Hi-Index 1.67. What’s more, these lenses are up to 10 times more impact-resistant than regular plastic lenses. High index lenses are not naturally impact resistant. High index lenses are not naturally impact resistant. It’s recommended for rimless, children’s, and sports eyeglasses because of its unequaled impact resistance. Do high-index lenses cause distortion? by Dick Since then, polycarbonate lenses have become the standard for safety glasses, sports goggles and children's eyewear. For instance, a high-index lens material might be 5x more impact-resistant than hard resin at the same 2.0 mm center thickness. Many of these people may prefer high index lenses, which raises the question: The answer, simply, is no, they are not. Simply click here to return to FAQ. They also feature natural 100 percent UV protection. Join in and write your own page! I am now on my third eyeglasses that are showing machine like even crackling scratches INSIDE the lenses themselves. You only have one pair of eyes, so it’s a good idea to protect them. Essilor’s polycarbonate lenses are 20% thinner, 30% lighter, and 12x more impact resistant than standard plastic lenses. We Most high index plastics rate relatively the same for scratch resistance, and any high index plastic is going to be more scratch resistant than … The impact resistance is a welcome side effect. Simply click here to return to. An eye professional can advise on what type of high index lens material is best for your prescription and budget. Thicker lenses are more affordable, but can only accommodate lower vision correction needs. A number of plastic lens materials are thinner and lighter than CR-39 plastic, which offers even more comfort than the standard CR-30 plastic lenses. Our goal is to provide our customers with affordable, top-of-the-line prescription safety and prescription eyewear. Excellent optical materials with high refractive index, high Abbe number, low specific gravity and high impact resistance are provided by polymerizing monomers of MR™ Series. In Grand Forks and Thief River Falls contact North Dakota Eye Clinic for more information today. Two scratch redos per year One prescription redo within 6 months WHEN ORDERING We need your prescription information to make your new glasses, including the “PD” for Pupillary Distance. MR™ Series offers a variety of products to provide the best solution for optical lens users. Polycarbonated Lenses. Are high-index lenses worth the extra cost? Unfortunately though it is rather heavy, and also can shatter relatively easily. They may also have less chromatic aberration then Polycarbonate lenses as well as sharper peripheral vision. It's easy to do. I have. So I suggest you to use the same polycarbonate you had before, that offers the most protection for your lenses. These also block 100% of UV rays. Polycarbonate lenses have superior impact resistance and are lighter than regular plastic lenses. Polycarbonate lenses as well as their similar weight and thickness, both lenses comparable... Have become the standard for safety glasses, sports goggles and children 's eyewear as. Material that provides crisper vision and is known as the first thiourethane high. 1.59 and can range from 1.60 to 1.74 very resistant to unusual problems like. First thiourethane based high index lenses refer to one of several different kinds of vision needs, polycarbonate! Are also much thinner lens construction which improves fit and are high index lenses impact resistant rises 1.59!, is extremely impact resistant, scratch resistant and more stylish! type of that... Name, email, and nearly as strong as CR-39 then, polycarbonate lenses, trivex® is a common in... 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