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Thread: Some Like it Dark

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  1. #1
    Registered User redclfco's Avatar
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    Some Like it Dark

    Some like it dark and I'm one of them.
    I bought a pair of sort of cool looking trifocal transition lenses sun glasses last summer, with the idea of having to only deal with one pair of glasses that I need for both close and far while touring. After riding a few times, I was disappointed, to say the least when I discovered that behind a helmet shield, or for that matter inside a car, they would not turn completely dark. Since I mostly ride with the face shield up in order to inject the smells and surroundings into my helmet, it wasn’t a big deal.

    But then today's ride happened, and what a surprise! Any chemists in the crowd?

    Minnesota temp today is in the teens today, and I just got back from a great 80+ mile ride on the hidden twisties along the Mississippi. I went down to see the bald eagles that start to line the shores each year in wait for the fish near Redwing and Wabasha, MN.

    The lenses are dark! The cold temperature apparently for some reason, results in the glasses getting pitch dark inside the shield, where in nice termps, they get sort of pissy gray.

    Any ideas of why this occurs?

  2. #2
    look out!!! Visian's Avatar
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    no, but i have noticed the same thing.

  3. #3
    Survivor akbeemer's Avatar
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    I cannot comment on the effects of temperature on the transition lenses, but I believe they become more sensitive to light as they age. Perhaps that is what you are experiencing; and I take it that would be a good thing.
    Kevin Huddy
    Tm Pterodactyl MT Outpost

  4. #4
    Registered User froggy's Avatar
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    I have had several pairs of Trans. over the years and every seller told me to sit them out in the sun several times so they can "Transition Completely".
    We drove all this way for a DEAD END ! My son!!!

    02 Silver RT1150 My 1st BMW Bike
    Craig

  5. #5
    Registered User WalterK75's Avatar
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    For what it's worth a couple of quick ideas. I'd suggest that behind a visor or in a car there isn't enough UV getting to the lenses to cause them to darken. My optician said car glass reduces UV and helmet visors do it also. It's possible that on your eagle trip you were exposed to direct sunlight, maybe when watching the eagles. Second thought, is that at this time of year the sun is lower in the sky and more in your face when riding, so more light hit the lenses since you said you ride with visor up. I don't know if temperature would affect the transition level or speed of transition, cool usually slows things down.

    Any opticians out there who know?
    Last edited by walterK75; 11-21-2010 at 12:42 PM. Reason: correcting a sentence

  6. #6
    warredon
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    I remember asking my optician about this years ago and he warned me about the lenses not darkening behind a car's windshield. I asked if they would darken at all. He said that maybe by only 10% - 15%, but not enough for me to hardly notice. I bought a pair a few months ago and didn't ride with them because of being told by others that they wouldn't darken behind my helmets shield.

    A while back I was reading a discussion about this on one of the boards and the consensus was that some brands of helmet shields block the UV rays and some don't. I then decided to do an experiment with my Scorpion EXO-700. I put my glasses behind the helmet's shield on a sunny day and placed it in my driveway. To my surprise the lenses darkened. It appeared that they were as dark as they normally get while not behind a shield, if not, it was close.

  7. #7
    Registered User
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    I am on about my 5th pair of transistion lenses and have not experienced what you descirbe. My optomitrist told me when I got the first pair to 'condition' them by placing them in the freezer for an hour. I have done so with each pair I have used and only 1 pair required re-conditioning after a couple years. They get plenty dark behind the full face shield and the car windshield.

    You might give it a try.

  8. #8
    Scottish Transplant Picinisco's Avatar
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    I like the progressive lens glasses that I wear since I can now see everything on the bike and around the bike, however the transition, as stated, does not take place behind the clear visor. This was excruciating returning from the rally to AZ via Vancouver BC. The bright sun had me screwing up my eyes which is very tiring. I now have a helmet with a retractable sun visor and that does the trick for me.
    2004 R1150GS 1978 R75G/S Frankenbike
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    Gilbert, Arizona

  9. #9
    Ute's Chauffeur
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    I am thinking of trying this lens. It is available as a prescription and turns dark based on visible light not UV, therefore can be used behind a windshield/visor. http://www.julbousa.com/lenses/falcon/

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