Can someone explain polarized lenses?

[millertime150]

I know they cut glare but what are the difference between the different companies?

Are cheap polarized sunglasses better than expensive ones?

I noticed that
Oakley says their polarized are 99%
Maui Jim ?
Kaenon 99.9%
Rudy Project 99.9%
Costa Del Mar 100%

Does this mean Costa cut 100% glare and are therefore better than the rest?

How about how they are polarized? Are some just a film layer and are some actually part of the glass?

I am just trying to figure out if one company's polarization is much better than anothers.

[clarky]

probably not the answer you're looking for- but I bought some louis vuitton sunglasses the other week, and the lenses are so crystal clear that it actually feels like i'm wearing prescription lenses compared to other brands- I know they're like a million times the price but they are seriously so much clearer
I don't know whether this is due to the plastic being higher quality or the polarization though

[mainaman]

The polarization effect i believe comes from the coating on the poly lenses. the cheap glasses do not have quality lens, probably the coating is similar as the expensive brands.

[mretzloff]

This brings back memories from physics class...

If I remember correctly, polarized anything will block out all light if held together. If only one polarized part is there it blocks out only part of the light.

Maybe Wikipedia has more information...

[SRock]

I my opinion polarized lenses are the way to go!

From Oakley:


Reflected glare is polarized light. That’s why you need polarized lenses to block it. Thing is, traditional polarization adds filters that can distort your vision. Not Oakley HDPolarized lenses. They infuse the polarization at a molecular level. No glued in filters, no distortion. And they filter the maximum amount of glare from water, snow, asphalt or whatever. Oakley HDPolarized. That’s performance far beyond the traditional.

I can tell you that poorly "polarized" lenses actually block more than just glare. When Oakley first started offering polarized lenses they inadvertantly blocked the ability to see laser light (not good for military) but they've since corrected the issue.

[whodat]

Polarized are the only way to go -- for driving, boating, walking around, etc. etc. etc. etc.

If my informational sources are correct, cheap polarized glasses usually have a plastic film that is polarized, while the more expensive ones will have a laminate with polarized film between glass / plastic lenses...

My favorite polarized glasses are from Wiley-X (http://www.wileyx.com/EcommSuite/ProductDetail.aspx?ActivityCode=FISHING&SeriesCode=567&ProductLine=392,P17&ItemCode=P-17GM) (those who've been deployed to an unpleasant sandy area of the world will probably recognize the brand). They have an assortment, but the one I linked to is the most "normal" looking (non-tactical).

[ogopogo]

A little anecdote.

I live in Pasadena CA at the foothills of the San Gabriel mountains. At the moment there is a wildfire raging. As I was driving north towards home today, I saw the smoke and clouds over the mountains. As devastating as it is, I couldn't help but notice the beauty of it. The heavy, thick smoke looked like a painting. It was made up of different shades of brown, orange and gold. From the top of the main mass there was huge white cloud. And towards the sides, it changed from the gold, orange-brown to different shades of gray, from light gray to steel gray, like heavy storm clouds. All of this against a backdrop of light blue sky. I know people throw the word "surreal" around a lot, but in this case it fits perfectly... it was like a painting, it didn't seem real at all, and it was beautiful.

I took my sunglasses off (Persols with gray polarized lenses) to take a better look, and as soon as I did that, the beautiful painting was gone. It still looked heavy, but gone were the golds and oranges, bright yellows and the sharp contrasts. Now it was just a big mass of different shades of dirty grayish browns.

Just an illustration of how polarized lenses can make such a huge difference.

[ClubmanRob]

If my informational sources are correct, cheap polarized glasses usually have a plastic film that is polarized, while the more expensive ones will have a laminate with polarized film between glass / plastic lenses...


Correct. Some polarized lenses are nothing more than a spray on coating while others are internally polarized.

[LagerLover]

Polarizing lenses will allow only light that is similarly polarized to pass through. If two polarizing filters are place together and rotate, they will become alternately opaque and then transparent again as the polarization first is in the same direction and then 90 degrees opposite.

LCD displays use this effect to generate displays, by suspending crystals in a liquid behind a polarizing filter. An electric voltage (potential) will "polarize" the crystals opposite to the polarization of the filter, creating an opaque digit.

Glare from reflections is filtered by polarizing lenses by the nature of the lenses to exclude light that is not polarized the same way; reflections are often randomly polarized, thereby the lenses will cut the reflected light. On your camera, a polarizing filter can be rotated to eliminate the surface reflection of the sun on water, allowing you to shoot subjects that lie beneath the water.

LCD displays often appear black when viewed with poloriod sunglasses, depending on the orientation of the display versus the sunglasses.

[gollum83]

Well there you go, LagerLover has you covered as far as the polarization explanation goes. As far as sunglasses go, I can't tell you which company is better than which considering I have been wearing glasses since I was in the third grade. So any sunglasses I wear have to be of the prescription kind, but I can tell you this. There's no functional difference between sunglasses that are 99% polarized and 100% polarized. In fact, I really wouldn't be surprised if claiming 100% polarization is a marketing ploy.

[Bertilak]

Correct. Some polarized lenses are nothing more than a spray on coating while others are internally polarized.

I never knew this and my first impulse was th say "Impossible! How would a spray-on keep the polarization in a uniform orientation?" But after a little thought perhaps they do the spraying in an electro-magnetic field that keeps the particles or droplets oriented. Do you know how it's done?


... reflections are often randomly polarized, thereby the lenses will cut the reflected light.

Polarized light is light whose waves are aligned with each other. Un-polarized light (which we can call "randomly" polarized) has waves that are unaligned, oriented in all directions. (Here we are talking about alignment directions transverse to the direction of light wave travel.) The only light that gets past a polarizing filter is light that is aligned with the polarizing filter. Well, it is actually a matter of degree -- the more closely aligned, the more likely to get through. Light oriented at 90 degrees to the filter is blocked. Since most of the light all about us is unpolarized (not aligned in any one orientation) much of it, but not all, passes through the filter.

Many reflections are polarized. This is because only properly oriented waves actually get reflected. In effect the reflection acts as the first of two polarizing filters. Our polarized sunglasses act as the second filter. Since the polarization of our sunglasses is, by design, oriented 90 degrees to the horizontal surfaces that do most of the bothersome reflecting almost all of that reflected light is blocked while much of the unreflected light passes through.

[gollum83]

I never knew this and my first impulse was th say "Impossible! How would a spray-on keep the polarization in a uniform orientation?" But after a little thought perhaps they do the spraying in an electro-magnetic field that keeps the particles or droplets oriented. Do you know how it's done?

Impossible? No they've been using anti-glare coatings on glasses for quite some time.

[Bertilak]

Impossible? No they've been using anti-glare coatings on glasses for quite some time.

Not the same thing. I have non-glare coating on my specs but they are not polarized.

[ratcheer]

Or, some lenses are both polarized and have non-glare coatings.

Tim

[ClubmanRob]

I never knew this and my first impulse was th say "Impossible! How would a spray-on keep the polarization in a uniform orientation?" But after a little thought perhaps they do the spraying in an electro-magnetic field that keeps the particles or droplets oriented. Do you know how it's done?


That would be my guess. I don't know positively, though. I went to order a new pair of Ray Bans, and they offered two types of polarization with the same percentage- except one was twice as expensive as the other. That was how it was explained to me, one was sprayed on and one was a "true" polarized lens. Supposedly the spray coats are more prone to scratching.

[gollum83]

Not the same thing. I have non-glare coating on my specs but they are not polarized.

Forget I said anything then.

[SRock]

Wiley-X does make some decent glasses. I've always kind of seen them as the poor mans Oakley's but they do have some good options and as others have mentioned all are impact resistant to the same level as the Oaks.

[PaulX608]

There are three different things at play here. Polarization, A/R(anti-reflective or non-glare), and UV protection. Polarization, as has already been defined above, blocks waves not aligned with the filter, thus providing the wearer with clearer, crisper, less visually 'noisy' images. This is an internal feature in the lens. A/R coatings are applied externally, generally just to the back side, to reduce glare on the back of the lens coming in from behind or from the side. There are different brands of A/R with different prices, some combined with scratch and smudge resistance. Some of these, such as 3M's Scotchgard A/R, are proprietary and can only be applied by licensed labs thus demanding higher prices. The percentages advertised with lenses refers to UV protection. Nothing comes out of our lab with less than 96% of UV blocked. We test every lens individually as part of our QC. Polarized lenses, because they filter ALL incoming waves, genrally block more UV as well. For example, our polycarbonate lenses genrally block 97% of UV transmission, while the polarized lenses block 99%.

[SRock]

There are three different things at play here. Polarization, A/R(anti-reflective or non-glare), and UV protection. Polarization, as has already been defined above, blocks waves not aligned with the filter, thus providing the wearer with clearer, crisper, less visually 'noisy' images. This is an internal feature in the lens. A/R coatings are applied externally, generally just to the back side, to reduce glare on the back of the lens coming in from behind or from the side. There are different brands of A/R with different prices, some combined with scratch and smudge resistance. Some of these, such as 3M's Scotchgard A/R, are proprietary and can only be applied by licensed labs thus demanding higher prices. The percentages advertised with lenses refers to UV protection. Nothing comes out of our lab with less than 96% of UV blocked. We test every lens individually as part of our QC. Polarized lenses, because they filter ALL incoming waves, genrally block more UV as well. For example, our polycarbonate lenses genrally block 97% of UV transmission, while the polarized lenses block 99%.

So do you work for 3M?

[PaulX608]

So do you work for 3M?

No sir, we have stock finished lenses with the 3M coating, but we can't apply their coating to our lenses we surface in-house. We send them out. Our lab is small, and we have no in-house A/R machine. So if we don't have your prescription in our stock lenses, or you need multifocals, we'd have to send them out if you want A/R.

[SRock]

No sir, we have stock finished lenses with the 3M coating, but we can't apply their coating to our lenses we surface in-house. We send them out. Our lab is small, and we have no in-house A/R machine. So if we don't have your prescription in our stock lenses, or you need multifocals, we'd have to send them out if you want A/R.

Cool, I could just tell you had more information/better understanding than many. I knew you must be in the business somehow.

[ClubmanRob]

There are three different things at play here. Polarization, A/R(anti-reflective or non-glare), and UV protection. Polarization, as has already been defined above, blocks waves not aligned with the filter, thus providing the wearer with clearer, crisper, less visually 'noisy' images. This is an internal feature in the lens. A/R coatings are applied externally, generally just to the back side, to reduce glare on the back of the lens coming in from behind or from the side. There are different brands of A/R with different prices, some combined with scratch and smudge resistance. Some of these, such as 3M's Scotchgard A/R, are proprietary and can only be applied by licensed labs thus demanding higher prices. The percentages advertised with lenses refers to UV protection. Nothing comes out of our lab with less than 96% of UV blocked. We test every lens individually as part of our QC. Polarized lenses, because they filter ALL incoming waves, genrally block more UV as well. For example, our polycarbonate lenses genrally block 97% of UV transmission, while the polarized lenses block 99%.

So are you saying that to your knowledge, there are no manufacturers out there (Ray Ban, specifically) that utilize a spray-on polarization process or "coating"?

[ogopogo]

I wonder how Persol lenses compare to other polarized lenses out there. Anyone know?

[PaulX608]

So are you saying that to your knowledge, there are no manufacturers out there (Ray Ban, specifically) that utilize a spray-on polarization process or "coating"?

As far as I know, no. But I will ask. I don't see how it would be possible or practical when the current internal film technology is so effective and inexpensive. Ray-Ban is owned by the company for which I work. They offer a few A/R and scratch/smudge resistant coatings. I suspect the most expensive is on their new P 3 and P 3Plus lenses. According to their ad info:

P 3 and P 3Plus lenses are the highest quality level of Polarized lenses, equipped with anti-reflective and hydro-oleophobic coatings. And the P3Plus lenses add a high-color enhancement(available only on new Tech Collection, Craft Collection and Ultra Limited Edition).



btw: hydro-oleophobic means the coating repels water and oil

[ClubmanRob]

As far as I know, no. But I will ask. I don't see how it would be possible or practical when the current internal film technology is so effective and inexpensive. Ray-Ban is owned by the company for which I work. They offer a few A/R and scratch/smudge resistant coatings. I suspect the most expensive is on their new P 3 and P 3Plus lenses. According to their ad info:

P 3 and P 3Plus lenses are the highest quality level of Polarized lenses, equipped with anti-reflective and hydro-oleophobic coatings. And the P3Plus lenses add a high-color enhancement(available only on new Tech Collection, Craft Collection and Ultra Limited Edition).



btw: hydro-oleophobic means the coating repels water and oil


Thanks. This whole subject has me interested. The limited research I've done on the internet refers to two different types of polarization that would seem to indicate that there are some lenses that are treated by a spray on coating that is different from the internally layered polarization.

[millertime150]

I hear occasionally that people get headaches from using polarized sunglasses. Anyone else hear this or experience this?

The people that get the headaches only get them with certain polarized lenses and not others which is confusing.

I was also at a store that sold Costa Del Mar and the store associate said that some people complain that Costa's polarized lens give them headaches.

[kyo_clone]

if you want beach/fishing glasses best glasses to cut glare is costa del mar. I have polarized oakleys i got them cheap if not i wouldve gone with the costas. Cheaper glasses have cheaper lens.

[Doc4]

A little anecdote.

I live in Pasadena CA at the foothills of the San Gabriel mountains. At the moment there is a wildfire raging. As I was driving north towards home today, I saw the smoke and clouds over the mountains. As devastating as it is, I couldn't help but notice the beauty of it. The heavy, thick smoke looked like a painting. It was made up of different shades of brown, orange and gold. From the top of the main mass there was huge white cloud. And towards the sides, it changed from the gold, orange-brown to different shades of gray, from light gray to steel gray, like heavy storm clouds. All of this against a backdrop of light blue sky. I know people throw the word "surreal" around a lot, but in this case it fits perfectly... it was like a painting, it didn't seem real at all, and it was beautiful.

I took my sunglasses off (Persols with gray polarized lenses) to take a better look, and as soon as I did that, the beautiful painting was gone. It still looked heavy, but gone were the golds and oranges, bright yellows and the sharp contrasts. Now it was just a big mass of different shades of dirty grayish browns.

Just an illustration of how polarized lenses can make such a huge difference.

I've had that experience before. :bored:

Such a bummer, driving along on vacation, seeing such great scenery, stopping to take a photo of the great sunset or whatever, taking off the sunglasses ... meh. :huh:

Perhaps there's a similar polarised filter one can pop onto one's camera?

[Bertilak]

Perhaps there's a similar polarised filter one can pop onto one's camera?

Polarized filters are quite common for cameras. Almost a necessity when shooting on open water.

[Thebigspendur]

They also sell them as fishing glasses allowing you to see deeper into the water.

If you take polarized sunglasses and rotate them you will see the effect change.

Most camera filters are designed to rotate to increase or decrease the degree of polarization depending on the effect you want. Usually polarization increases contrast so blue sky is much darker and clouds are much whiter. The effect can be dramatic.

[Seraphim]

I prefer to look at the world through rose colored glasses!

[Kouros]

The bad part of polarized lenses happens while driving. When I look through ther rearview mirror I can see the tint on the back window. That is one way to check if your lenses are polarized.

[ratcheer]

Boy, this old thread sure came roaring back from the dead.

Tim

[Monkeydad]

I had an expensive pair of polarized sunglasses from The Bon Ton years ago. Wore them to Ocean City, was standing on a rock by water on the beach and a big wave smacked me, knocked me back about 15 feet and stripped the coating off my lenses! :closedeye

That was the last time I bought a pricey pair of glasses...now I spend $10-15 and treat them as disposable...because sunglasses of any price seem to end up being disposable anyways.

[Commander Quan]

I never bought expensive sunglasses before, but last year my fiancee who works for her dad and uncle who are optometrists and loves her sunglasses (and buying new ones) bought me a pair of Maui Jims with the brown lenses and I have to say they are amazing. I am pretty sensitive to bright light, so I wear them everyday. I times I notice the biggest difference is when I am driving. They cut the glare so well and reduce eye fatigue.