Author Topic: Polarized lenses or not  (Read 8755 times)

Bean

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Re: Polarized lenses or not
« Reply #15 on: July 20, 2017, 08:54:01 AM »
The biggest problem for me is that once I get it--and it comes on fast--I have it for a while. Taking the glasses off doesn't end the spell for a while. Sometimes it takes as much as ten minutes to clear up. Getting Vertigo a mile from the Kahalui Harbor entrance at the end of a Maliko run is not my idea of fun.

I agree and once light starts dimming I drop my shades to my chest because I'm also prone to vertigo.  This is a great point.  Also ... no eggs within two hours of the run.

But man, on a sunny day, you can't beat 'em.
Why the two hour egg rule?

Yes, and why can't you beat 'em on a sunny day...geez?

headmount

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Re: Polarized lenses or not
« Reply #16 on: July 20, 2017, 12:20:15 PM »
The biggest problem for me is that once I get it--and it comes on fast--I have it for a while. Taking the glasses off doesn't end the spell for a while. Sometimes it takes as much as ten minutes to clear up. Getting Vertigo a mile from the Kahalui Harbor entrance at the end of a Maliko run is not my idea of fun.

I agree and once light starts dimming I drop my shades to my chest because I'm also prone to vertigo.  This is a great point.  Also ... no eggs within two hours of the run.

But man, on a sunny day, you can't beat 'em.
Why the two hour egg rule?

Yes, and why can't you beat 'em on a sunny day...geez?
Because polarized sunglasses are in their element on sunny days and i really enjoy the anti glare properties of Maui Jims.  Polarization and anti-glare are two different facets and MJs have both.  I like the polarization for being able to see into the water and noticing when I'm approaching a shallow reef.  On a sunny day it seems like a mood enhancer as well.  Yep, you just can't beat 'em... but I take them off when it gets cloudy.  These high grade glasses are expensive so I've lashed a float strap on mine .  Also I wear goggles which I also wish had the same properties. 

Eggs give me a headache if I eat them too close to exercise.  If I eat them at all now, it's after exercising.  May not be the same for someone else.  Lots of things starting to fall apart for me physically and my system seems fragile.  But if I'm careful I still have up to two hours of intensive in me.

headmount

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Re: Polarized lenses or not
« Reply #17 on: July 20, 2017, 12:22:31 PM »
These are my sunnies.  Sorry about the scary pic.  Couldn't find a beautiful model.

clay

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Re: Polarized lenses or not
« Reply #18 on: July 20, 2017, 04:22:33 PM »
Last time i wore them was the first time I tried sup surfing, at high noon, I was disoriented for the rest of the day.

My understanding is humans have been on the water for thousands of years without glasses, either they all went blind or they know something we don't?
Aloha, I welcome and appreciate all responses of positivity and good feeling.

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SUPcheat

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Re: Polarized lenses or not
« Reply #19 on: July 20, 2017, 05:16:55 PM »
If the main goal is UV protection, any number of plastics, glasses and lenses do a pretty decent job.  UV is readily absorbed.  It is infrared that passes through more.  Infrared can still cause redness and irritation, though, so using blue or gray lenses can help.

I told my wife that in the car, even if the light feels hot, very little UV is getting through the windshield and the windows.  She doesn't believe me.

Polarized lenses do have a strobing effect that can disturb those sensitive to such things. They also make smart phone screens look weird and sometimes unreadable.
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headmount

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Re: Polarized lenses or not
« Reply #20 on: July 21, 2017, 02:20:10 AM »
Last time i wore them was the first time I tried sup surfing, at high noon, I was disoriented for the rest of the day.

My understanding is humans have been on the water for thousands of years without glasses, either they all went blind or they know something we don't?

Eyesight has as many variables as there are people so what works for some may not for others. 

Also the thought crossed my mind that some people might be of a younger generation unfamiliar with the term, 'can't beat'em'  It means they're great and you can't find anything better.  Two people asked so I assume I'm using non-current language.

yugi

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Re: Polarized lenses or not
« Reply #21 on: July 21, 2017, 02:47:21 AM »
...
My understanding is humans have been on the water for thousands of years without glasses, either they all went blind or they know something we don't?

Mostly they died well before they developed cataracts. Now life expectancy is a lot longer.

I love polarised glasses for cocktail hour and lounging as the sky and cloud really "pops". For active action sports on sea and snow I do not like the reduced read of the surface. At speed on these elements you want as much read of the surface that you can get.


Bean

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Re: Polarized lenses or not
« Reply #22 on: July 21, 2017, 03:02:04 AM »
Yugi, the good news is that there are artificial lens implants available that not only treat the clouding and hardening of your lenses (cataract), but also the loss of near and intermediate vision.  I had one done 2 years ago with a Bausch and Lomb Crystalens and it's phenomenal.

Eagle

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Re: Polarized lenses or not
« Reply #23 on: July 21, 2017, 01:09:19 PM »
Fantastic also for seeing depth for rocks and checking keel on a sailboat but certain screens can get blacked out or look weird.  Can be a major pain.  But pros outweigh the cons for me.  Vertigo would be a huge pita.
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clay

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Re: Polarized lenses or not
« Reply #24 on: July 23, 2017, 09:27:42 PM »
...
My understanding is humans have been on the water for thousands of years without glasses, either they all went blind or they know something we don't?

Mostly they died well before they developed cataracts. Now life expectancy is a lot longer.


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I believed that for several decades.  Then I heard stories about how indigenous cultures have a tradition of revering and taking care of their elders, and native Indians elders having wrinkles and grey hair.  I started asking the question how exactly has modernity increased life span?
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lucabrasi

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Re: Polarized lenses or not
« Reply #25 on: July 23, 2017, 10:00:17 PM »
Tough to beat Maui Jims or Costas.
I really like the shallow water prizm Oakley has had out for a couple of years but the deep water one may be better for others.

Here is a non polarized lens I really like even when out on the water. The lens is available in other frame styles as well.
http://www.smithoptics.com/us/Root/Discontinued/Sunglasses/Approach-Max/p/APMPCGNMWT

PonoBill

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Re: Polarized lenses or not
« Reply #26 on: July 24, 2017, 06:31:00 AM »
Bean's humorous take on Headmount's ambiguous reference seems to have slid right by everyone. Good'un Bean.

Yes, Bill, the deterioration continues. Of course anyone over 30 is well past their expiration date. We're supposed to pass on the envelope with our DNA and then become fertilizer. Rock on.
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tallguy

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Re: Polarized lenses or not
« Reply #27 on: July 24, 2017, 08:43:21 AM »
In case anyone is interested, this is how, in brief, the sunlight that reaches earths surface becomes polarized:

From Wikipedia:
"The Rayleigh sky model describes the observed polarization pattern of the daytime sky. Within the atmosphere Rayleigh scattering of light from air molecules, water, dust, and aerosols causes the sky's light to have a defined polarization pattern. The same elastic scattering processes cause the sky to be blue. The polarization is characterized at each wavelength by its degree of polarization, and orientation (the e-vector angle, or scattering angle)."

The $300 polarized shades on your head filter (polarize) the sunlight to vibrate/wave travel in one uniform direction.  Combine this with the slight polarization of the atmospheric light and you get what is know as
the "winking effect".  Simply stated, imagine a picket fence.  Then take another picket fence and rotated it in front of the first.  When they are lined up you can mostly see thru both, but when they are 90 degrees to each other all you get is cross pickets, or "crossed hairs" in mineral optics terms.  This is why as you move your head around relative to the dominant polarized atmospheric direction you have probably noticed the sky or objects change in intensity, color saturation, or brightness.  And this is the primary source of vertigo, it messes with your brain/eyes/inner ear balance and depth perception....ergo you go splat off da board, yah?

When in college my friends would always think the photomicrograghs of slices of ground down thin rocks were really cool.  Look at all the pretty colors!!  Then you show them the slides under the microscope using polarized light, and rotated the micro table, the colors wink in and out, psychedelic like.  Pass the Maryjane please....

and yah, I caught the egg joke (yoke)...hehehe

PonoBill

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Re: Polarized lenses or not
« Reply #28 on: July 24, 2017, 09:27:38 AM »
Naturally I used to be a microscope geek. Polarized light is a big deal for seeing small, and UV increases resolution for taking photographs at extreme magnification. the geeky kid with a limited budget's version of an electron microscope. One of my failed science projects (I usually had at least one false start per year) was an attempt to develop some fluorescing UV dyes to give high contrasts with circular polarization. My UV source was a carbon arc focused on the microscope mirror with a reflector from an old flash camera. Gave me a spectacular sunburn under my nose. I can't recommend it.
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