Which is better CR-39 or polycarbonate?

It’s optical quality is nearly as good as glass , it really is half as heavy as glass, it is a lot more resistant to shattering, and still very resistant to scratches. To get the best value, it’s necessary to understand the features and benefits of all eyeglasses lenses and treatments. Choose wisely through the help of an established optician or eyewear retailer. Anti-reflective coating is particularly important if you choose high-index lenses. This is because the bigger the refractive index of a lens material, the more light the lenses reflect. Some high-index lenses reflect around 50% more light than CR-39 lenses, causing a lot more glare.

Anti-reflective coating , scratch coating, UV protection, and anti-fog treatment may also be available to “tweak” the properties of your glasses to just how you want them. In case you have questions about obtaining the right Nike prescription glasses, contact us today.
We were introduced to polycarbonate lenses in the 1970s they and have changed the optical world for the better. Far thinner and much more resistant than CR-39 or any other plastic or glass lenses, polycarbonates are known for their lightweight and protective features. During the Indochina hostilities, prescription-wearing U.S. military members were issued conventional spectacle lenses that have been worn in the combat zone.

Trivex® Lenses5

Some top features of CR-39 include low cost and excellent optical quality. However, the lenses tend to be thick, and can offer you “bug-eyes” with higher prescriptions. High index lens material is actually a higher density version of the polycarbonate lens.
To compete effectively today, eyecare professionals must begin by promoting the latest technology in vision maintenance systems to your customers. In the past 20 years, several different types high-index plastic lenses have already been introduced. These lenses are significantly thinner and lighter than regular plastic lenses. They have an increased index of refraction and are obtainable in an aspheric lens design . High-index lenses can reflect up to 50% more light than regular plastic lenses.

• This only matters if you choose rimless glasses, where the mounting point of the lenses should be drilled into the side of the lens.
• You can even tint polycarbonate lenses, however they don’t accept color and plastic lenses.
• The optician can help decide which high index lens would work the best for you personally.

The index of refraction of an eyeglass lens material can be an indicator of how efficiently the material refracts light. This efficiency is related to how fast light travels through the material. They are convenient if you don’t want to carry a pair of clear eyeglasses and another couple of sunglasses. Although they block 100% of UV rays and reduce glare, some people discover that photochromic lenses usually do not turn dark enough while inside the car or on an overcast day. It’s around 10X more impact-resistant than high-index lenses and is which means ideal lens material for sports protective eyewear and children’s glasses.

Mamma Mia! Designer Sunglasses Make Great Gifts For

If you’re like the majority of, you probably put a lot more thought into selecting your frames than your lens material. Trivex has the same advantages as polycarbonate such as for example 100% protection against UV and superior impact strength. While it’s slightly lighter than polycarbonate, it also includes a slightly lower index of refraction. The big benefit of Trivex over polycarbonate is its better optical quality, which means your vision is sharper. In most cases, CR-39 lenses are widely acceptable as the standard. They’re very affordable and durable, however they need to have special coatings applied in order to be scratch-resistant, blue-light reflecting, and UV reflecting.

• However, if you have an increased prescription (above +/- 3.00), polycarbonate lenses are thinner and lighter and can result in a much nicer-looking couple of eyeglasses.
• These lenses are half as heavy as glass, but much less likely to shatter.
• A variety of colors may be accomplished by dyeing of the top or the bulk of the material.

Another advantage that Trivex has over polycarbonate is that it can be easily tinted. There’s much more to buying a new pair of eyeglasses than simply selecting an ideal frame. There are numerous lens materials, lens coatings, tints, etc. also it can sometimes feel overwhelming. Understanding the different lens options available can make the process significantly less stressful. These details will explain the essential forms of lens materials available and the most common lens options. Before then, opticians used glass lenses to fabricate prescription lenses.

Comparing Lens Materials

Nevertheless, they’re still the norm and provide a lighter, more durable eyewear experience than glass. Exactly like frames, there’s plenty of different types of lens that are used in eyewear. Since theemergence of eyewear in the 13th Century, glass would be blown into shape to magnify objects and would be used in early types of glasses. Early glasses were hard to come by and usually only afforded by the absolute wealthiest people, not forgetting the refractive power of the early lenses were pretty limited.
With polycarbonate and CR-39 lenses, an aspheric design is optional and available for an added cost. In aspheric lenses, the curvature of the lens changes gradually from its center to its edge. This enables the use flatter curves when fabricating eyeglass lenses. In comparison with other lens materials, high-index nor polycarbonate are recognized to supply the ultimate in optical clarity.