what does polarized sunglasses mean

Sunglasses lens that are polarized are going to have the crystals manipulated so that they will block out the waves that are most dangerous to your eyes: ultra violet and blue light.
Sunglasses that are polarized are going to block more harmful sunlight for your eyes than any other pair of sunglasses, with the exception of an eye-patch (and I don’t even think those count as sunglasses).
Polarized sunglasses block between 95% and 99% of these harmful rays, extending the time your eyes can be out in direct sunlight by hours.
For those people who don’t spend a lot of time outdoors or simply use the sunglasses as a fashion statement, polarized lenses are not a necessity.
As a little side note, if you take two pairs of polarized sunglasses and line the lenses up, then turn one pair of shades 90 degrees, the lenses will appear to completely black out.

In addition, polarized lenses may reduce the visibility of images produced by liquid crystal displays (LCDs) or light-emitting diode displays (LEDs) found on the dashboards of some cars or in other places such as the digital screens on automatic teller machines and self-service gas pumps.
Besides boaters, outdoor enthusiasts who benefit the most from polarized sunglasses include skiers, bikers, golfers and joggers, all who may enjoy a clearer view along with elimination of glare.
Polarized sunglasses have been popular for years with boaters and fishermen who need to reduce reflected glare from the water surrounding them.
Polarized lenses contain a special filter that blocks this type of intense reflected light, reducing glare.
Whether you spend your time waterskiing or boating, in-line skating or mountain biking, driving or jogging, polarized sunglasses may be the right choice to help you enjoy your life outdoors.
Polarized sunglasses also can be worn indoors by light-sensitive people, including post-cataract surgery patients and those continually exposed to bright light through windows.
But now that many others who spend time outdoors have discovered the benefits of polarized lenses, interest in these types of sunglasses has soared.
Polarized bifocal sunglasses or progressive lenses are examples of options for the presbyope who also likes outdoor sports.
Though polarized sunglasses improve comfort and visibility, you will encounter some instances when these lenses may not be advisable.
Some experts say the polarization reduces the glare caused by the sun’s rays reflecting off the snow, while others warn that using polarized lenses may reduce a skier’s ability to distinguish between regular snow and more dangerous conditions such as icy patches.
Polarized lenses are the only way to eliminate the glare while still blocking the harmful UV rays that traditional sunglasses block.
Because polarized lenses are treated with that special chemical film that neutralizes the glare, objects are much clearer and the harmful effects of glare (and light in general) on the eyes are reduced.
While tinted sunglasses will reduce brightness, they don’t remove harsh glare like polarized lenses do.
Because polarized sunglasses are designed to help reduce the glare from surfaces like water, snow, and glass, they have become quite a thing for sports, driving, and water activities.
– Result: Never wear Polarized glasses for Flying When I’m fishing/surfing the glare from the sun bouncing off the water is not only blinding, it stops me seeing what is in the water with any great ease.
By blocking the reflected light with polarized glasses I can see through the water as the excess light is no longer visible.
If your eyes are light sensitive then Polarized lenses may be for you.
– Result: Wear Polarized lenses for water sports.
Polarized sunglasses protect your eyes, non-polarized lenses do not.
Cell Phone, PDAs, Computer Screens, SatNavs and almost all other portable screens are polarized, which means that when you view them with polarized glasses they can sometimes be rendered black (And thus un-usable).
You deserve nothing but the best for your eyes so that is what we, Crush sunglasses, give you! Most of our styles are UV400 protection and if they dont have that then they are polarized.
Polarized sunglasses have a special filter in the lens that blocks reflected light, and reduces the glare you get from the sun.
That is why Crush wants to take those worries, of your eyes being harmed, go away and offer you a little bit of knowledge on what you are getting when you buy a pair of Crush sunnies.
On the other hand polarized lenses allow in the vertical component of light, which is preferred for clear vision, while eliminating the easily scattered and skewed horizontal component of light.
It depends on the quality of the filter and how the lens has been produced. Cheap polarized sunglasses may only cut out 10% of reflected light, but many people don’t realize there is a difference in filter quality in better made glasses.
For example, Julbo’s Polycarbonate Polarized lenses cut out around 60 – 70% of reflected light, and ther NXT Cameleon, Octopus and Polar HD lenses cut out 99% of reflected light.
Most tinted lenses will provide some absorption to dampen brightness, but only a polarized lens can effectively eliminate blinding glare.
Although the light from the sun is not polarized, it can be separated into two polarized components that are reflected and transmitted in different amounts by the surface of the water.
More recently, high-energy visible light (HEV) has been implicated as a cause of age-related macular degeneration;[11] before, debates had already existed as to whether "blue blocking" or amber tinted lenses may have a protective effect.[12] Some manufacturers already design to block blue light; the insurance company Suva, which covers most Swiss employees, asked eye experts around Charlotte Remé (ETH Zürich) to develop norms for blue blocking, leading to a recommended minimum of 95% of the blue light.[10][13] Sunglasses are especially important for children, as their ocular lenses are thought to transmit far more HEV light than adults (lenses "yellow" with age).
Wearing sunglasses under direct sunlight: Large lenses offer good protection, but broad temple arms are also needed against "stray light" from the sides.
The most widespread protection is against ultraviolet radiation, which can cause short-term and long-term ocular problems such as photokeratitis, snow blindness, cataracts, pterygium, and various forms of eye cancer.[9] Medical experts advise the public on the importance of wearing sunglasses to protect the eyes from UV;[9] for adequate protection, experts recommend sunglasses that reflect or filter out 99-100% of UVA and UVB light, with wavelengths up to 400 nm.
An alternative is to use the corrective glasses with a secondary lenses such as oversize sunglasses that fit over the regular glasses, clip-on lens that are placed in front of the glasses, and flip-up glasses which feature a dark lens that can be flipped up when not in use (see below).
Oversized sunglasses, because of their larger frames and lenses, are useful for individuals who are trying to minimize the apparent size or arch of their nose.[31] Oversized sunglasses also offer more protection from sunburn due to the larger areas of skin they cover, although sunblock should still be used.
Several standards for sunglasses (see below) allow a general classification of the UV protection (but not the blue light protection), and manufacturers often indicate simply that the sunglasses meet the requirements of a specific standard rather than publish the exact figures.
During space walks, the visor of the astronauts’ helmets, which also has a thin gold coating for extra protection, functions as strong sunglasses.[24][25][26] The frames of sunglasses and corrective glasses used in space must meet special requirements.
Sunglasses which meet this requirement are often labeled as "UV400." This is slightly more protection than the widely used standard of the European Union (see below), which requires that 95% of the radiation up to only 380 nm must be reflected or filtered out.[10] Sunglasses are not sufficient to protect the eyes against permanent harm from looking directly at the Sun, even during a solar eclipse.
The most common type of sunglasses with interchangeable lenses has a single lens or shield that covers both eyes.
Inadequate dark lenses are even more harmful than inadequate light lenses (or wearing no sunglasses at all) because they provoke the pupil to open wider.
“UV eye damage is cumulative over a lifetime,” Kehoe says, “so it’s important to make wearing sunglasses a habit early in life.
But very inexpensive sunglasses are likely to contain lenses that are stamped out of a mold rather than ground and polished, and that can affect optical quality.
Sunglasses are especially important for children, says Peter Kehoe, OD, an Illinois optometrist who specializes in children’ vision.
Polarized lenses reduce glare by filtering out the reflected sunlight that bounces off surfaces like water or pavement.
"Just as we’ve learned that you can get a really nasty sunburn on an overcast, hazy day, you’re exposing your eyes to damaging UV rays on these days, too," Royal says.
The downside: It can be difficult to read your cell phone, GPS device, or a liquid-crystal display on a dashboard or ATM machine with polarized lenses.
While more expensive sunglasses may offer more stylish frames, higher quality lenses, sharper images and less glare, it is very easy to find inexpensive glasses that offer 100% UV protection.
False: As long as they offer 100% UV protection, photochromic (such as Transitions-brand lenses) lenses provide the same level of UV protection as regular sunglasses.
A clear lens with no tint and 100% UV protection is better for your eyes than dark, heavily tinted sunglasses without UV protection.
However, one of the $5 pair of sunglasses had a “100%” sticker on the lens and turned out to not offer the advertised level of protection.
In fact, dark lenses without adequate UV protection are actually worse for your eyes than not wearing glasses at all, because the dark tint causes your pupils to become dilated, thus exposing your eyes to more harmful UV light.
When you’re driving, polarized sunglasses eliminate the glare that reflects off flat surfaces and interfers with vision.
Polarizing lenses selectively filter out the horizontal light, thus eliminating glare.
Vertical light brings useful information to the human eye, enabling us to see colors and contrasts, while horizontal light simply creates optical noise or glare.
After all you do not want to change your optical frames for prescription sunglasses while driving as this could be dangerous.
1.1mm polarized lenses are made from thicker sheets of film, the polarizing layer is the same thickness as the .75mm film but the lens is thicker to offer impact resistance.
At some point the material in the test tag should become noticeably darker.  If you don’t have a test tag you can take two pair of polarized glasses and look thru both, now rotate one glass 90 degrees.
.75mm polarized lenses are made from sheets of film and are used in glasses where impact resistance is not a requirement.
Polarized sunglasses lenses are invaluable in high-glare situations, such as driving, boating, golfing, surfing, and fishing.
The polarized lenses help reduce glare, which can be a real problem in water sports and many other outdoor activities.
As always, there are exceptions to the rules! Polarized glasses with a Yellow tint or clear will not change a test tag.
Our latest best selling polarized sunglass is very unique, made by Oasis optics they have a built in bifocal magnifier that makes it easy to read or do minute tasks like tieing a fly or hook.
Most new polarized sunglasses should come with a polarized test tag or lens sticker that indicates they are polarized.
Polarized lenses are most commonly associated with sunglasses, though there are normal prescription glasses with polarized coating as well.
Polarized glasses have a built-in, laminated filter that permits only vertical light rays to pass through, and almost totally blocks horizontal rays to eliminate glares.
If you’re having trouble with your current sunglasses and feel that polarized lenses might help, run it by your doctor.
Polarized lenses offer specific protection from UV rays and are particularly suited for some activities.
Perhaps you do not consider professional truck drivers to be “operators of heavy machines.” Still, I would appreciate knowing which group of heavy machine operators are discouraged or prohibited from wearing polarized lenses on the job — and why.
Any activity that involves rapid changes in lighting conditions, such as hunting under the heavy canopy of a forest, may benefit from polarized glasses, since they also partially eliminate the glare of light directly on the glasses.
Depending on your use for sunglasses, polarized lenses may offer no noticeable improvement over regular sunglasses.
The superior quality of polarized glasses provides protection against ultra violet rays of the sun.
Most leading manufacturers of glasses offer models with polarized coatings and you can find them at most sunglasses outlets.
If you need the power of polarized lenses without the help of sun protection, speak with your doctor or optometrist about this.
Whenever you buy sunglasses, verify the UV protection level of the lenses, usually marked right on the glasses.
But, despite popular theory, polarized lenses don’t represent significantly increased UV protection.
So, when the sun casts glare into your eyes, reach for polarized lenses.
A high quality pair of sunglasses may include polarized lenses.
The people who find the greatest use for polarized lenses are those that work around or on the water, like fishermen and boaters.
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Would you like to duplicate a worn frame, because it was the most comfortable you’ve used, or the size has grown on to you? Be sure to search for these three numbers discussed, or ask an eye care specialist to make take the measurements for you.
If you own an eyeglass pair, chances are you may have seen three numbers imprinted or engraved on the interior of the temple, nose bridge or arm.
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And the lenses are made of vertical polarizes so Voila! They effectively neutralize the villainous glare! Advantages of Polarized Sunglasses: Polarized sunglasses are specially made for reducing the harmful effects of glare and eye-damaging light.
And the lenses are made of vertical polarizes so that they will effectively neutralize the villainous glare! Advantages of Polarized Sunglasses: Polarized sunglasses are specially made for reducing the harmful effects of glare and eye-damaging light.
As opposed to regular sunglasses, polarized lenses reduce glare and improve vision clarity from flat surfaces like a wet road or the hood of a car.
Polarized sunglasses lenses are made to neutralize the effect of glare.
Answer Polarized sunglasses help reduce the glare from reflected surfaces such as water or metal.
And they are a perfect boon, for all your outdoor activities.Polarized eye wear For outdoor activities that involves blinding sunlight" Polarized eye wear For outdoor activities that involves blinding sunlight Sports, Golf, Skiing, Fishing, Riding, Mountain Climbing and more.. Polarized lenses are perfect for a whole variety of activities.
In order to avoid delays and speed up your answers.
95% of the questions received at Smith are answered below.
Polarized lenses are transparent material on a lens, could be glass or plastic, and block certain types of light waves.
There are those that will ONLY buy polarized lens sunglasses and others who really don’t care or really don’t know or understand what polarized lenses do.
In order to distinguish them, Ray-Ban has added a ‘P’ on the lens of the polarized ones.
Sometimes, customers will buy a pair of Ray-Ban sunglasses without knowing they are polarized.
If you go skiing, go fishing, drive in the sun a lot you’re best suited to purchase a pair of polarized sunglasses.

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