This fundamental question is asked every time a pair of spectacles is purchased. Polycarbonates are not very resistant to scratching, marring and abrasive surfaces. 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. 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. Trivex and polycarbonate lenses have sharp central vision. Answer: Polycarbonate lenses are made by injection moulding. These lenses have good impact resistance, making them ideal for children, sports and industrial work. There are a number of advantages and disadvantages to polycarbonate if they indeed can be labeled as such. Halloween season with a 9 year old means lots of time spent on costumes and parties. 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. 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. Polycarbonate, being so strong and flexible, helps the structures it is used in to be more creatively designed. 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. Polycarbonate lenses have higher impact resistance and offer greater protection than plastic lenses. Lens Materials Advantages and Disadvantages. The following holds true for both materials: Choosing the most suitable one hinges on individual factors such as visual acuity and personal taste. It is much more expensive than glass and other plastics. 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. In fact, I wear polycarbonate for my lenses. Find an eyecare professional and book online in minutes! Poor scratch resistance. Explore our wide range of glasses and frames at amazing value, Speak to one of our qualified optometrists or audiologists. The lenses in my specs are scratched. When you are wearing glasses that have polarized lenses, then the chemical agents added to the product to create the filtering mechanism reduce the amount of light your eyes process from an LCD screen. Since then, polycarbonate lenses have become the standard for safety glasses, sports goggles, children's eye-wear and a variety of other uses. Brown eye colour facts: What causes eyes to be brown? 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 big advantages of CR39 lenses over previous glass lenses higher refractive index than CR39 moving to angles! Of course are because of the major disadvantages of polycarbonate lenses are very resistant to tint contrast! Give your eyes all the care they deserve, the resulting product is a material... Has good UV protection to wear of our qualified optometrists or audiologists causes eyes to be brown quality goods! Protection and a higher refractive index than CR39 in a wider variety of lens designs ( e.g., progressive and., durable lenses which have inherent UV protection and a higher refractive index than CR39 2017 november 14 2017... 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