It may also impact the amount of color that some people can perceive when looking at information or watchin… They are being used more for household products now than before because of the quality of goods that they can produce. Polycarbonate is by far the safest lens available. This fundamental question is asked every time a pair of spectacles is purchased. Although Trivex lenses provide an almost endless list of advantages, there are some downsides. Trivex lenses were introduced in 2001 by PPG Industries. Halloween season with a 9 year old means lots of time spent on costumes and parties. Brown eye colour facts: What causes eyes to be brown? Buy your contact lenses online and get free delivery. They have good impact resistance and are therefore ideal for children, sports and industrial purposes. Polycarbonate, being so strong and flexible, helps the structures it is used in to be more creatively designed. Progressive lenses have three prescriptions in one pair of glasses. © 2000-2021 AAV Media, LLC. Or, if you have any condition where you see better out of one eye, these can help protect your "good" eye. The melted polycarbonate is then rapidly injected into lens moulds, compressed under high pressure and cooled to form a finished lens product in a matter of minutes. These disadvantages are as follows: Less availability. Trivex lenses have a higher Abbe value and for higher prescriptions (>+/-4.00) may produce sharper peripheral vision with less chromatic aberration than polycarbonate lenses. ADVANTAGES OF PHOTOCHROMIC LENSES Disadvantages of Trivex Lenses . 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 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. High-quality polycarbonate lenses are not the cheapest option on the market. Although you can still see them when you have a direct line-of-sight, moving to different angles can make the screen disappear completely. First of all, they are so durable that they are hard to get shattered even in the roughest conditions. Polycarbonate lenses are available in a wider variety of lens designs (e.g., progressive lenses and other multifocals) than Trivex lenses. Polycarbonate lenses eyeglasses have many advantages. The polycarbonate … The big advantages of CR39 lenses over previous glass lenses were light weight, and better shatter resistance. 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. 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. Contacts for teens: What age can you wear contacts? By their very nature and chemical makeup, high index lenses have distinct advantages over standard plastic or glass. Here are some advantages of polycarbonate lenses: Durable, providing extra safety to your eyes and promoting better eye health 10 times more resistant to impact than plastic eyeglasses, so they don’t shatter or break as easily Boast scratch resistance so they last longer than regular plastic lenses 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. Polycarbonate lenses advantages and disadvantages. Disadvantages of Polycarbonate By Keith Allen Hunker may earn compensation through affiliate links in this story. Prescription lenses can be made out of 3 main materials: Glass, CR-39 optical plastic, and impact-resistant polycarbonate. They are high-quality, durable lenses which will protect their owner from multiples threats including physical damage and UV radiation. 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. Next, polycarbonate lenses are hard to get scratched. As a result, denting is possible on the surface if care is not taken. Weight Trivex has a lower specific gravity than polycarbonate, making Trivex lenses about 10 percent lighter than polycarbonate lenses. In fact, part of the reason that they are so durable is also the reason for this disadvantage. Polycarbonate is more common in different lens designs than Trivex. Like polycarbonate lenses, lenses made of Trivex are lightweight and more impact-resistant than regular plastic or glass lenses. Not enough thinness. First things first, I would like to apologize for my extended absence. 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. Clarity. They also have good UV protection and a higher refractive index than CR39. Polycarbonate lenses are made by injection moulding. The lower weight allowed eyeglass makers to experiment with larger size lenses, since CR39 is much lighter in weight. Trivex has a slightly lower specific gravity than polycarbonate, making Trivex lenses about 10 percent lighter than polycarbonate lenses. Both polycarbonate and Trivex lenses are thinner and lighter than regular plastic lenses. All About Vision and AllAboutVision.com are registered trademarks of AAV Media, LLC. When carbon is bonded to three oxygen molecules by a condensation polymerization process, the resulting product is a polycarbonate material. It is much more expensive than glass and other plastics. Polycarbonate lenses have higher impact resistance and offer greater protection than plastic lenses. Poor scratch resistance. sunglasses are very different from each other as the sunglasses have a set tint that protects our eyes from glares but they are not changeable whereas the photochromic lenses easily adapt to the nature of the light present around and changes accordingly. Both polycarbonate and Trivex lenses offer 100% sun protection from UV rays. High Index Lenses: Pros and Cons. Eye refraction and function: How does the eye work? The biggest disadvantage is their high price. Polycarbonate lenses are made by injection moulding. Spectalce lenses made of polycarbonate were introduced in the early 1970s in response to a demand for lightweight, impact-resistant lenses. Trivex lenses offer better clarity for both central and peripheral vision. Unlike glass, the structures that use polycarbonate can be shaped like domes, igloos and many other fancy shapes that add a design feature to the building. Visual acuity: Is 20/20 (or 6/6) perfect vision? Choose glasses that are sturdy, attractive, shatter-resistant, comfortable – and finally easy to wear. Polycarbonate lenses are about 10% thinner than Trivex lenses. Your baby: Infant vision development timeline. 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. Photochromic lenses and polarized lenses i.e. In fact, I wear polycarbonate for my lenses. Answer: Polycarbonate lenses are made by injection moulding. November 14, 2017 November 14, 2017 / The Optical Jedi. 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. They will survive the impact of a steel ball travelling at 160 km/hr without shattering which meets EN/EU … These types of lenses cannot be tinted easily, either. This does not mean, however, that high index lenses are without drawbacks. As they are far less likely to fracture than regular plastic lenses, polycarbonate lenses also are a good choice for rimless eye-wear designs where the lenses are attached to the frame components with drill mountings. Here's what to look for, Guide to buying the best sunglasses for kids, Teens: Choosing sunglasses for a teenage boy or girl, Understanding how to read a contact lens prescription, How to use, put in and remove contact lenses, Lens care: Cleaning, disinfection and storage, LASIK eye surgery recovery & healing time expectations, 8 tips to reduce cataract surgery recovery time, LASIK procedure: A guide for what to expect, Eye and visual acuity tests and the Jaeger eye chart, Preparing for an eye exam: What to expect, Colour blindness tests and types of colour blindness, Macular degeneration: How to cut your risk, How to boost your diet to protect ageing eyes, Ageing eyes: Signs of eye problems in elderly, Red eyes in photos: How to get rid of the red-eye effect, Applying eye drops: A guide on how to put in eye drops. – Optical quality is not as high as high index lenses or standard CR39 plastic. Plastic lenses do not have inbuilt protection against harmful ultraviolet rays, unlike polycarbonate lenses which have inherent UV protection. Trivex and polycarbonate lenses have sharp central vision. UV Protection. This explains the explosion of … Blue eyes: The origin and genetics of blue eyes, How to clean and remove scratches in glasses, Eye and vision problems in preschool children. High price is one of the major disadvantages of polycarbonates. Disadvantages include the fact that their abrasion resistance is poor - adding an anti-scratch coating can help but reduces the impact resistance slightly. On the other hand polycarbonate is a thermoplastic that starts as a solid material in the form of small pellets. These lenses have good impact resistance and therefore are ideal for children, sports and industrial purposes. Pros and Cons for High Index Lenses. Polycarbonates are not very resistant to scratching, marring and abrasive surfaces. What are the advantages and disadvantages of polycarbonate spectacle lenses? Polycarbonate panels have a few disadvantages when they’re compared to plastic or glass.
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