Photochromic lenses are available in Trivex as well. Is it possible to get them polished or will I have to get new lenses? The advantages of this material of course are because of its properties. They also offer 100 percent protection from the sun's harmful UV rays and are up to 10 times more impact-resistant than plastic or glass lenses. Polycarbonate was developed in the 1960s for aerospace applications and is currently used for the helmet visors of astronauts and pilots and was used for the windscreens of the space shuttles. Polycarbonate lenses are highly resistant to impact, won’t shatter, and are 10 times stronger than glass or standard plastic, making them ideal for children, safety lenses, and physical activity. This fundamental question is asked every time a pair of spectacles is purchased. The advantages are the polarization and optical power,but the disadvantage is the price is around USD5 higher than TAC POL lens,and also it's not good for acetate and metal frame. The cost of polycarbonate and Trivex lenses can vary considerably, but many optometrist charge more for Trivex lenses than polycarbonate lenses. Spectalce lenses made of polycarbonate were introduced in the early 1970s in response to a demand for lightweight, impact-resistant lenses. How do you know if a new-born baby needs glasses? Polycarbonate lenses have higher impact resistance and offer greater protection than plastic lenses. It also has good UV protection and a higher refractive index than CR39. The lower weight allowed eyeglass makers to experiment with larger size lenses, since CR39 is much lighter in weight. They also have good UV protection and a higher refractive index than CR39. Weight Trivex has a slightly lower specific gravity than polycarbonate, making Trivex lenses about 10 percent lighter than polycarbonate lenses. By their very nature and chemical makeup, high index lenses have distinct advantages over standard plastic or glass. Trivex lenses, however, are composed of a urethane-based monomer and are made from a cast moulding process similar to how regular plastic lenses are made. Your baby: Infant vision development timeline. Polycarbonate lenses are about 10% thinner than Trivex lenses. Believe it or not, it has more advantages for sunglasses and for those who wear it. Buy your contact lenses online and get free delivery. The polycarbonate … Pros and Cons for High Index Lenses. Lens Materials Advantages and Disadvantages. They also have good UV protection and a higher refractive index than CR39. Lightweight and thinner than glass lenses, polycarbonate is more comfortable to wear for long periods of time. They are being used more for household products now than before because of the quality of goods that they can produce. – Optical quality is not as high as high index lenses or standard CR39 plastic. Polycarbonate lenses advantages and disadvantages. Property of resistance. Although you can still see them when you have a direct line-of-sight, moving to different angles can make the screen disappear completely. Despite its many advantages, polycarbonate isn't the only lens material suitable for safety applications and children's eye-wear. High price is one of the major disadvantages of polycarbonates. 1. These materials are much more expensive than plastic or glass and as a result, customers opt for Acrylonitrile Butadiene Styrene … These lenses have good impact resistance, making them ideal for children, sports and industrial work. Polycarbonate has a high price, It is much more expensive than the other plastics or the glass , It is as much as double the price of ABS, So, The customers opt for Acrylonitrile Butadiene Styrene ( ABS ) that is tougher, but it has lower impact resistance and heat resistance. Did you know you can now enter your prescription and buy online? Polycarbonates are not very resistant to scratching, marring and abrasive surfaces. AR coating eliminates distracting lens reflections that can interfere with vision, particularly when driving at night or in other low-light conditions when glare sources are present. Polycarbonate is the standard choice for almost … The three main topics when discussing potential disadvantages of yellow-tinted blue-light-absorbing lenses are complaints of scotopic vision loss, altered color perception, and sleep disturbance. Photochromic lenses and polarized lenses i.e. Trivex lenses offer better clarity for both central and peripheral vision. ADVANTAGES OF PHOTOCHROMIC LENSES Here are the advantages/disadvantages of each material: Glass: Glass was the original material prescription lenses were made out of, however, it is now used on a limited basis. These lenses have good impact resistance, making them ideal for children, sports and industrial work. © 2000-2021 AAV Media, LLC. Your optometrist can discuss the pros and cons of polycarbonate and Trivex lenses, and help you decide which lens material is the best choice for your needs and budget. Coronavirus (COVID-19): How eyes may play a role in its spread, Eye twitching: 8 causes, treatments and prevention, A bloodshot eye or red eye: 19 causes and treatments. These disadvantages are as follows: Less availability. Disadvantages include the fact that their abrasion resistance is poor - adding an anti-scratch coating can help but reduces the impact resistance slightly. In fact, part of the reason that they are so durable is also the reason for this disadvantage. Polycarbonate Lenses (1.59 Index) Polycarbonate is one of the strongest and safest materials on the market. And then polycarbonate lenses eyeglasses are much lighter than glass or plastic glasses, which make them more comfortable to wear. In fact, I wear polycarbonate for my lenses. Clarity: A lens that’s optically clearer provides a better picture. Blue eyes: The origin and genetics of blue eyes, How to clean and remove scratches in glasses, Eye and vision problems in preschool children. Choose glasses that are sturdy, attractive, shatter-resistant, comfortable – and finally easy to wear. High Index Lenses: Pros and Cons. Poor scratch resistance. For all their durability, flexibility, and impact resistance, polycarbonate scratches easily. When carbon is bonded to three oxygen molecules by a condensation polymerization process, the resulting product is a polycarbonate material. Are photochromic or tinted lenses suitable for driving in. Polycarbonate and Trivex lenses both block 100 percent of the sun's UV rays without the need for special UV-blocking lens coatings. This explains the explosion of … POlycarbonate is more impact resistant, great on children, and less likely to chip on the edges. The disadvantages of polycarbonate lenses include the fact that their abrasion resistance is poor, but when an anti scratch coating is added to this the impact resistance is reduced slightly. The material is very soft compared to some alternatives, opening itself up to scratches more than plastic or trivex lenses. Polycarbonate lenses are very resistant to tint in contrast to plastic lenses which accepts tints. This combination of lightweight comfort, UV protection and impact resistance also makes these lenses an excellent choice for children's glasses and safety glasses. Halloween season with a 9 year old means lots of time spent on costumes and parties. Here is a brief comparison of polycarbonate and Trivex lenses to help you decide which lenses might be best for you: 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. Disadvantages of polycarbonate lenses. As a result, denting is possible on the surface if care is not taken. Polarized lenses make it difficult to view LCD screens. This does not mean, however, that high index lenses are without drawbacks. Eye allergies: Relief for itchy and watery eyes, How to get rid of a stye: Treatments and remedies, Glaucoma treatment: Drugs, drops and more, Computer eye strain: 10 tips to get relief, Digital devices and children: Protecting their eyes, Hyperopia (long sightedness): How to correct for it. The problem is, people think it's bad for their health. Pop in for an eye test to give your eyes all the care they deserve. UV Protection. Both polycarbonate and Trivex lenses are thinner and lighter than regular plastic lenses. First of all, they are so durable that they are hard to get shattered even in the roughest conditions. Polycarbonate is by far the safest lens available. 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