Cr-39 Vs Polycarbonate

High index lenses, such as 1.66, 1.74, and 1.9, are much thinner than regular glass or plastic. Talk with your physician to decide which high index lens is right for you. An easy method to remove scratches from polycarbonate is to squeeze a pea-sized quantity of toothpaste on a soft, clean cotton cloth. Rub the toothpaste on the scratched surface in a circular motion continuously for seconds.
Trivex lenses are thin, lightweight and impact resistant. This lens is another preferred choice for safety eyeglasses and children’s eyeglasses. The Plastic CR-39 (1.49 index) lens material is a superb choice for lower prescriptions and full-rimmed frame applications. Plastic lenses have good optical clarity and are available in practically all lens types. However, the plastic lenses are really thick and are prone to scratching. The Plastic CR-39 material can’t be used with rimless style frames.

• They have great optics, are heat resistant, and maintain their dimensional stability (meaning they won’t become cloudy or warp as time passes).
• Glass shards entering the attention can cause severe injury.
• distanced objects, and for reading.
• as heavy as glass, far less likely to shatter, and optical quality nearly as good as glass.
• An alternative solution material to polycarbonate is CR39 , a plastic polymer popular in the manufacture of eyeglass lenses.
• Exactly like frames, there’s plenty of various kinds of lens that are used in eyewear.

Polycarbonate is the go-to lens for children’s eyewear, sports goggles, and safety glasses due to its high impact resistance. One drawback is that polycarbonate tends to have significantly more chromatic aberrations than any lens material, which means poorer visual quality. Although many people prosper with polycarbonate lenses, some have trouble adapting to them because of the visual quality. I have -3.50 in both eyes and have always worn glasses with polycarbonate lens. I haven’t had any problems with polycarbonate personally.

Optics As Priority

radiation detection application, CR-39 is used as a solid-state nuclear track detector to detect the presence of ionising radiation. Energetic particles colliding with the polymer structure leave a trail of broken chemical bonds within the CR-39. When immersed in a concentrated alkali solution hydroxide ions attack and break the polymer structure, etching away the bulk of the plastic at a nominally fixed rate. The resulting etched plastic therefore contains a permanent record of not only the location of the radiation on the plastic but additionally gives spectroscopic information about the source.

There are a wide selection of high index lenses such as for example Hi 1.60, Hi 1.67 and Hi 1.74. The optician will help decide which high index
When you are looking at your eyeglass prescription, an advantage (+) register the “sphere” section indicates a farsighted correction, while a minus (-) sign indicates a nearsighted correction. The higher this number, the stronger your prescription. The number in the “cyl” section indicates the strength of your astigmatism correction. If there is no number here, there is no need astigmatism.
CR-39 is now a trade-marked product of PPG Industries. Assuming you have hard resin lenses (CR-39), you should look at obtaining a scratch resistant coating. Resins and plastics are more vunerable to scratches than glass. Scratches damage the cosmetic look of the lenses in addition to their performance. With a scratch resistant coating, you don’t have to worry so much about minor scratches on your own lenses.

Trivex Vs Polycarbonate Lenses

In america, most high index lenses are made of the many plastic materials. Various other countries still use a lot of glass material for high index lenses. Glass is available in very high indices such as for example 1.8 and 1.9 but due to its density it really is still very heavy. Glass lenses also take longer for optical labs to fabricate.

• Polycarbonates are a band of thermoplastic polymers, that have carbonate groups within their chemical structure.
• If you work with your glasses for indoor reading or computer work, and your prescription level isn’t too much, then plastic works fine.
• The regular polycarbonate is preferable to this, but still definately not the CR-39.
• EyeBuyDirect’s polycarbonate lenses are cut at a 1.59 lens index.

Other great things about Trivex include fewer chromatic aberrations than polycarbonate, and it is the lightest lens material. In our last post, we discussed the new technology of digital lenses for high-definition vision. Today, we will discuss the different glasses lens materials available. After the War, the Armorlite Lens Company in California is credited with manufacturing the first CR-39 eyeglass lenses in 1947.

Prescription Glasses: Plastic, Polycarbonate, Or Trivex Lenses?

Used for a number of manufactured parts, they can easily be worked and molded to help fit into different materials. We were introduced to polycarbonate lenses in the 1970s they and also have changed the optical world for the higher. Far thinner and much more resistant than CR-39 or any other plastic or glass lenses, polycarbonates are recognized for their lightweight and protective features.
It’s obvious to my eyes that CR-39 is really a huge improvement looking out of them in virtually any direction include center. You can buy an excellent poly lens, but it will cost 10x to 40x around the equivalent in an inexpensive CR-39. In case you are highly myopic, considering the various high index options makes sense, to provide you with a thin and light lens, while reducing the optical quality compromise. Everything you gain in impact resistance and higher index, you pay for in the way the lens transfers light into your eye.