These lenses are 8% to 25% lighter and thinner than CR-39 (normal plastic), depending on the prescription. 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. It's easy to do. It is also not easily scratched. This material is so tough and shatter resistant that it is also used to manufacture airplane windows. Learn more about how Polycarbonate lenses or impact-resistant lenses are up to 10 times more impact resistant than regular plastic lenses. Polycarbonate is a good choice for impact resistance if your prescription is not very high, or if you need. The refractive indexes of traditional plastic lenses and glass lenses are about 1.5 and 1.52 respectively. Acetone is a common chemical in nail polish removers and some other solvents that may be around your house. 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. They can resist acetone, which few plastics can resist, including polycarbonate. In Grand Forks and Thief River Falls contact North Dakota Eye Clinic for more information today. and can accommodate MANY kinds of vision needs, including higher prescriptions. 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. 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. High-index plastic is available with the following indexes of refraction: 1.54, 1.55, 1.56, 1.6, and 1.66. The higher the number, the thinner and lighter the lens. Join in and write your own page! 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. These also block 100% of UV rays. All high-index lenses sold on Eyeconic.com are scratch and impact resistant. You only have one pair of eyes, so it’s a good idea to protect them. So I suggest you to use the same polycarbonate you had before, that offers the most protection for your lenses. Impact resistant lenses are manufactured using an injection molding process which makes them stronger than standard lens materials. That … The impact resistance of both materials can be attributed to their ‘softness’ compared to other high impact lenses. And remember – better safe than sorry! Thinner lenses are lightweight (and more stylish!) by Dick Any lens material with a refractive index higher than these numbers are considered a highly index lens material. Your email address will not be published. They are considered a high index plastic. Many of these people may prefer high index lenses, which raises the question: The answer, simply, is no, they are not. The high index does not provide additional impact resistance, it depends only on the material. Rx-Safety.com is a family-owned and – run optical lab and online store. The lenses are a high-index plastic material. 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. Simply click here to return to. Polycarbonate Lenses are ideal for rimless frames or anyone using their glasses for sporting activities. It is important to consider the fact that, in a dangerous environment, it is a poor decision to trade safety for aesthetics. The combination of a thinner center and a brittle AR coating might drop the … Q: I've worn polycarbonate lenses for many years because of a strong prescription (-6.5/ -7.5). An eye professional can advise on what type of high index lens material is best for your prescription and budget. 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. 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. I have. It is widely known that polycarbonate lenses are much lighter and thinner than regular plastics. The lower numbers are classified as mid-index lenses. It is lighter and more scratch resistant and has high-impact resistance like Polycarbonate. Polycarbonated Lenses. 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. Thicker lenses are more affordable, but can only accommodate lower vision correction needs. Simply click here to return to FAQ. 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. The difference between your glasses' lens index can make a huge impact. It's easy to do. When a worker falls, their body harness, lifeline, self-retracting lanyard, and anchor are all subjected to a high impact. High Index Lenses . As well as their similar weight and thickness, both lenses provide comparable impact resistance. These lenses are perfect for anyone with stronger prescriptions, but not only limited to just those individuals. Impact-resistant lenses reduce the number of eye injuries from eyeglasses and sunglasses. The impact resistance is a welcome side effect. They’re also ideal for strong prescriptions since they do not add thickness when correcting vision, minimizing any distortion. They also feature natural 100 percent UV protection. 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. 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. MR™ Series is especially suitable for ophthalmic lenses and is known as the first thiourethane based high index lens material. Join in and write your own page! The glasses I'm using currently are hi-index plastic and while it's ok, it doesn't feel, Q: Please help. Unfortunately though it is rather heavy, and also can shatter relatively easily. How? The 1.53 mid-index Trivex lens is a polymer lens that is the most impact-resistant lens available. Learn more about how Polycarbonate lenses or impact-resistant lenses are up to 10 times more impact resistant than regular plastic lenses. Conversely, polycarbonate, one of the lowest-index lenses, is extremely impact resistant and flexible but very soft and easy to scratch. 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. High index lenses are not naturally impact resistant. They are also very resistant to unusual problems, like several chemicals. High index lenses refer to one of several different kinds of plastic lens material. High index lenses are the thinnest lenses for stronger prescriptions. 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). In terms of balancing price … Lenses made from Trivex are extremely resistant to common problems like being dropped or scratched. 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. 1. 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. Save my name, email, and website in this browser for the next time I comment. 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. Do high-index lenses cause distortion? What’s more, these lenses are up to 10 times more impact-resistant than regular plastic lenses. This will come down to personal preference, but they can be game-changers for people used to thick, heavy lenses. Most high index scratch-resistant lenses are 50 percent lighter than CR-39 plastic lenses. Unless these material can all withstand the force of the impact, … They offer comfort and clear visioneven when you wear them for a long time. How to Choose the Right Glasses Lens Differences among different lens indexes can generate great impacts. Prescription lenses all have a definite "index", which ranges from 1.56 to 1.74. 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. 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. They may also have less chromatic aberration then Polycarbonate lenses as well as sharper peripheral vision. High index lenses are not naturally impact resistant. (Ames, Iowa). How? Hi, I'm Endre with my brother Arpi. Your email address will not be published. Polycarbonate lenses have superior impact resistance and are lighter than regular plastic lenses. Q: I want to get plastic lenses because of the high abbe value. 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. Polycarbonate lenses are made of a type of plastic that is more impact-resistant than standard plastic lenses. This ensures more comfortable glasses even if your farsightedness, nearsightedness, or astigmatism prescription is high. There are no scratches, Q: 1. Polycarbonate lenses are less likely to fracture than plastic lenses or hi-index, so they are a great option kids’ glasses. High-index lenses have a low Abbe value, which means they disperse more light than traditional lenses. We Deciding which you should get depends on your prescription and your lifestyle. 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). However, labs would generally surface this material down to 1.5 mm and then perhaps add an AR coating to it. Essilor’s polycarbonate lenses are 20% thinner, 30% lighter, and 12x more impact resistant than standard plastic lenses. Some of these lens indices may not be available at all depending on how strong or weak your prescription is. How thick would plastic lenses be on a round size 48 frame? Mid-index lenses, such as 1.54, 1.56, and 1.57, are thinner than glass, and nearly as strong as CR-39. © RX Safety - Developed by ISEA Media & Cosmick Technologies. A comparison between polycarbonate and high-index lenses. I am now on my third eyeglasses that are showing machine like even crackling scratches INSIDE the lenses themselves. Glass lenses, plastic lenses, or laminated glass lenses can be made impact resistant … 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. 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. Our goal is to provide our customers with affordable, top-of-the-line prescription safety and prescription eyewear. 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. High-index lenses have an index of refraction that starts at around 1.61 and can go as high as 1.74. Required fields are marked *. 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. 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!). 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. 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. Are high-index lenses worth the extra cost? 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. The power and base curve of the lens will also affect its impact resistance. We hope to be helpful for you! Polycarbonate 1.59 index lenses are a thin and lightweight material, that is very resistant to impacts. MR™ Series offers a variety of products to provide the best solution for optical lens users. A high-index eyeglass lens allows people with a stronger prescription to wear a lens that is lightweight and thin. Compared with polycarbonate lenses, Trivex® is a premium material that provides crisper vision and is 10% lighter. 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. All rights reserved. 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. Hi-index plastic is lightweight and thinner than most plastic. Their refractive index rises above 1.59 and can range from 1.60 to 1.74. 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. A type of high index lenses refer to one of the lowest-index lenses, is extremely impact resistant scratch... If you need lighter than CR-39 ( normal plastic ), depending on how or. Thinner and lighter the lens will also affect its impact resistance if your farsightedness,,. 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