Polycarbonate lens material is so tough that you can hit it with a hammer and it won't shatter. Ordinary polarizing lenses are made out of plastic (CR-39), and are not shatter resistant. In addition, polycarbonate lenses absorb harmful UV radiations.

Ordinary tinted lenses reduce brightness but only polarized lenses eliminate glare. Sand, snow, and water are all sources of polarized glare, which is why our Micro-Filter Lens Technology® is perfect for boaters, fishermen and any water sport enthusiasts.

These are special tinted lenses that polarize light as it passes through. This means that light from only certain planes is allowed to pass through while the rest is eliminated. Visually, the effect would be to get rid of unwanted stray light. This can be quite useful for the avid fisherman, for example, who wants to see just beneath the surface of the water without having to worry about distracting reflections from the surface.

CR-39 refers to the type of plastic that is used to make prescription lenses. This is optical plastic and provides very little distortion .It is more lightweight and thinner than glass making it comfortable to wear. It is more impact resistant than glass, but may still break and shatter upon impact. Therefore, it is not recommended for active sports and motorcycling. It is more scratch resistant than polycarbonate, but will scratch if not properly taken care of.

Glass: Glass offers the best optical clarity, meaning that there is virtually no distortion in glass lenses. This is why it is the material of choice in manufacturers such as Ray-Ban, Revo, Vuarnet, and Serengeti. However, glass is the least impact resistant of all of the material, and may shatter upon impact. Shattering means that the lens will split into small pieces which can easily enter the eye and cause permanent eye injuries or even blindness.

Polycarbonate (PC) is a high-impact shatter resistant plastic material that does not retain odor, and can withstand extreme temperatures. It is dishwasher safe plastic material, which is approved by the FDA of the United States. Our bottles are made out of original Polycarbonate materials, the best thermoplastic out there. Polycarbonate plastic materials are made by only a handful of international companies such as General Electric Company and Bayer.

Polycarbonate lenses are plastic lenses that are ten times more impact resistant than other plastics making them very suitable for contact sports or butter fingers! They offer UV protection and stop 99.9% of rays from the sun, fluorescent lights and computer screens. They come with a scratch resistant coating, are thinner than standard lens and therefore more comfortable to wear.

People generally report that glass provides about 10% better performance than plastic. And there is reason to believe that under windy conditions, glass is preferred since it doesn't flap in the wind and dissipate heat from the cooker. Plastic, however, is often recommended since is much less fragile and easier to transport and works plenty well. One excellent, easily-obtained plastic film is oven cooking bags. These are for sale in grocery stores and cost less than US$1 per bag.

Both the polycarbonate composite matrix helmets and the fiberglass/Kevlar helmets comply with the exact same standards-DOT and Snell. These are "pass-fail" standards and do not reflect any continuum or graduated level of compliance. The VX-14 and VX-17 dirt helmets also comply with both standards. No one can tell (or guarantee) you one will be any safer than another in an accident.

No, the standard polarized lens is actually a little lighter. If you would like a darker pair, we will be offering a new lens in May 2007. .

The "standard plastic" lenses are often called "Hard Resin", "CR-39 plastic", or just quot;plastic" lenses. CR-39® is actually a PPG Industries registered trade name for a DADC (diallyl diglycol carbonate) polymer that was introduced in 1941. The "CR" stands for Columbia Resin and CR-39 was the 39th batch or formula made by Columbia Laboratories in Ohio.

We do not recommend this nor do we install film on it. However below is Llumar ? documentation regarding this question we are asked often which may be beneficial to you in answering the question you have been searching for: The answer is somewhat complex. Generally speaking, the simple and flat answer (as of January 2000) is "NO," though research is always on-going and new specialty products more compatible with plastic sheeting are always a future possibility.

Varilux has conducted extensive clinical research, the result of which has produced a lens offering all presbyopes naturally comfortable vision never before achieved with a progressive lens. With over 100 million pairs sold, the unique triple-patented* varilux lens is the brand most prescribed by eye care professionals and trusted by millions of satisfied wearers.

Plastic lenses are lighter and have 3 x the impact resistance of glass while glass lenses are thinner. No, the price on the frame relates only to the frame. Lens prices vary depending on the material and design of the lenses required. Ask your optometrist or dispenser to advise on the most suitable lens type for your prescription.

All of our lenses are made of plastic as they are lighter and more popular. Most spectacles are currently made with plastic lenses. If you would like glass please email us and we will advise you of costs etc

Polarized lenses reduce glare caused by water, wet surfaces, snow, etc. Inexpensive polarized lenses compromise quality often resulting in headaches from straining the eyes. Our polarized lenses are specially imported from Japan.

These lenses are not polarized as they are designed to be used in low light conditions (such as rain, fog, dusk, dawn, etc.), thus no need for them to be polarized.

Polycarbonate is the other material commonly used in domed skylights. Polycarbonate is used in applications where impact resistance is a requirement. It is the material used in our Miami-Dade Approved Hurricane Impact Skylights. It is even popular in areas that may be prone to Hail Damage. Polycarbonate can be formed just as easily as acrylic.