Which lens material is the most scratch resistant?
For those reasons Trivex may be the better choice in a mid-index lens. Some lens materials like polycarbonate and trivex have built-in scratch resistance. However, it’s important to know that not absolutely all scratch-resistant treatments offer equal protection.
Polycarbonate was developed in the 1970s for aerospace applications. It is useful for the helmet visors of astronauts and for space shuttle windshields.
The refractive index of a basic plastic lens (CR-39) is 1.498 meaning that light travels 1.498 times faster in vacuum pressure than it can through the plastic lens. Eyeglass lenses tend to be categorized by their refractive index .
Trivex Lenses
The expense of polycarbonate and Trivex lenses can vary considerably, but many optical stores charge more for Trivex lenses than polycarbonate lenses. Trivex lenses have less internal stress and could produce sharper central vision than polycarbonate lenses. Photochromatic lenses are great for people who do not wish to carry a separate pair of prescription sunglasses.
There are various lens materials, lens coatings, tints, etc. also it will often feel overwhelming. Understanding the different lens options available can make the process significantly less stressful.
Most eye care professionals provide a lens warranty to protect your lenses against scratches for a specified period of normal use. This flexibility does mean polycarbonate and Trivex lenses need a scratch-resistant coating to prevent surface scratches. Today’s modern scratch-resistant coatings could make the top of polycarbonate and Trivex lenses nearly as hard as glass.
This information will explain the essential forms of lens materials available and the most frequent lens options. Lenses with the best scratch protection are treated on leading and backside with a clear, hard, scratch-resistant coating. This can minimize the harm to your lenses in the event that you accidentally drop them, or clean them with the wrong type of material. In this article, we are going to be discussing specifically plastic and polycarbonate eyeglasses and the major differences between both lens materials.
Standard Plastic Cr
Since the introduction and usage of Plastic lenses (also called CR-39), it has sealed its mark as the most preferred choice in the optical industry. This is primarily because of its high optical clarity, low cost, impact-resistant, and durable property. Ultraviolet treatment is put on lenses to protect against harmful UV light that can accelerate the development of cataracts and macular degeneration. Flatter peripheral curves also reduce distortions that occur when looking from the biggest market of the lens, making vision crisper. New 2019 Evolution modelsWe’ve recently taken delivery of some terrific new 2019 Evolution models. Manufactured for our sister company Evolution Eyewear Ltd, these brand-new models are all available with our standard Evolution special offer – buy any two models and et the…
Others thin out lenses that would otherwise be thick and stand out of a frame. If you need safety glasses, consult an optician who can let you know which frames are safety rated. Polycarbonate lenses can be purchased in a wider variety of lens designs (e.g., progressive lenses along with other multifocals) than Trivex lenses. Polycarbonate and Trivex lenses both block completely of the sun’s Ultra violet rays without the need for special UV-blocking lens coatings. High index plastic is more scratch-resistant than standard plastic or polycarbonate.
- In general, as index increases, hardness increases, and lenses are more brittle.
- Eyeglass lenses are often categorized by their refractive index .
- properties and shatter resistant properties of polycarbonate.
- Even the highest-index plastic continues to be less scratch resistant than any glass material.
polarised film is on leading it can scratch and finally lose a few of its polarising properties. On more costly polarised sunglasses (typically above £60) the lens material may very well be polycarbonate. Here the polarised film is sandwiched between two layers of polycarbonate meaning the polarised film can’t ever wear out. Importantly, a polarised polycarbonate lens also provides impact protection.
Polycarbonate Vs Trivex Lenses Compared
Polycarbonate lenses are very resistant to tint in contrast to plastic lenses which accepts tints. Plastic lenses are inexpensive and affordable than polycarbonate lenses which tend to be more expensive.
