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. See similar questions...

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. See similar questions...

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. See similar questions...

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. See similar questions...

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. See similar questions...

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. See similar questions...

Polycarbonate lenses are more impact resistant and lighter than regular plastic material. It is the preferred lens for minors. A scratch resistant lens does make a lens scratch resistant. But, that does not make it scratch proof. However, if you do purchase this coating, we warranty the lenses with a one time, one year replacement. See similar questions...

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. See similar questions...

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. See similar questions...

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. See similar questions...

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. See similar questions...

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 See similar questions...

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. See similar questions...

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. See similar questions...

Feathers are more flexible, thereby reducing incidental contact that the fletching might have with an arrow rest. Any vane can be used to fletch straight, right or left helicals. Conclusion: The weight difference is basically negligible and in most cases can be ignored. The real concern should center around likely weather conditions and arrow clearance. See similar questions...

Polarized lenses are able to block not only direct glare, but also indirect glare which bounces off water or the roadway while driving. Regular tinted lenses do not offer this. See similar questions...

All Florida Building Code approved hurricane protection provides good protection and all of the Florida Building Code approved hurricane protection must pass the tests required by the State of Florida. ArmorPanel? passed the exact same tests as steel, aluminum and polycarbonate panels. That said, it is subjective to say that one protection is 'better' than the other but we believe that ArmorPanel? provides excellent protection and a host of features not offered with 'hard shell' solutions. See similar questions...