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Thread: Photochromic Lenses Life Expectancy

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    Photochromic Lenses Life Expectancy

    I am interested in knowing what people have found the life expectancy (when a noticeable change in the speed of color change occurs) of the photochromic lenses they have been selling. What brand(s) have you been selling and have you seen a difference in the life expectancy between different brands?

    Doc

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    Glarse or plarstic?

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    Quote Originally Posted by chip anderson
    Glarse or plarstic?
    Plastic

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    probably a year without AR and about three years with

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    Around 2-3 years for regular usage, which is meant to match life expectancy of a prescription. The lenses I've tried are serengetti (plano) and transitions. I cannot really comment on the difference in life expectancy of various brands due to differing usage rates, a fair comparison cannot be made. Generally, they do not differ much between brands with similar coatings, at least that's what I've heard from the veterans.

    In fact, after about 1 year 8 months of persistent daily use with several cycles of change in tints, one will find that they don't get activated as quickly as when it was new. What I've found is that the older generations which are not as sensitive to changes in UV conditions appear to last slightly longer.

    What I'm more interested to know is if there is any way or method these "spent" photochromic lenses can be restored.

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    Most peoples rx will change before lenses "lose" the changability.

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    I know Transisitons don't work well past 2 or 3 years but sometimes I get patients in my office that have Transisitons older then this. I ask them if their lenses are still working and they always say they still work well. ??? Maybe the rate of decline with these lenses are slow enough that most people just don't notice? I don't argue with them.

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    Photochromic life

    Most photochromics in plastic are compromised of same/similar photo-chemicals, which usually last 3-4 years before breaking down.
    I have seen many last 5 years of regular usage.

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    opti-tipster harry a saake's Avatar
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    life

    i would think that the life expectancy would also depend on how much they are being used in the sun

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    3-4 years with AR for Next Generation. The older brands lasted less then a year. And now we sell a lot of INDO lens, they are really good, but i don't know if they are available outside Europe.

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    Banned Jim Stone's Avatar
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    Has anyone gotten back any yet that have stopped changing?

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    Any manufacturer's have any input?

    Anyone tested life in the South as compaired to more Northern climes?

    Does CR-39 photochromic last more or less than Poly photochromic?

    Surely the folks that make this stuff has some information beyond advertizing propaganda. Lets hear from you.

    Chip

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    Underemployed Genius Jacqui's Avatar
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    Quote Originally Posted by Jim Stone
    Has anyone gotten back any yet that have stopped changing?
    I got one back that didn't change.
    Proud Member of the ABE Club!
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    Banned Jim Stone's Avatar
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    Quote Originally Posted by Jacqui
    I got one back that didn't change.
    How old was it? Was the problem with the pair or just one lens? Did it ever change?

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    Banned Jim Stone's Avatar
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    Quote Originally Posted by For-Life
    probably a year without AR and about three years with
    Why would AR make them last longer?

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    Underemployed Genius Jacqui's Avatar
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    Quote Originally Posted by Jim Stone
    How old was it? Was the problem with the pair or just one lens? Did it ever change?
    It was a fresh lens. Can't remember the brand, I'll check tomorrow if needed. I tried to force it to work under a UV light and it will now get about 10-15% as dark as it should.
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    Quote Originally Posted by Jim Stone
    Why would AR make them last longer?
    Steve would probably be the technical guy here to explain it. But it incases the lens. Apparantly also Alize makes the transitions change faster. I assume that would make it the same with all AR then.

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    Master OptiBoarder rinselberg's Avatar
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    Quote Originally Posted by Jim Stone
    Why would AR make them last longer?
    Hi Jim. I remember what Jim Schafer posted:
    AR Coatings provide another benefit besides the obvious intent, by creating an oxygen barrier and sealing the lens (protects the dyes and plastic from photo-oxidation reactions). This barrier can virtually double the life of the product.
    That was in http://www.optiboard.com/forums/show...1577#post41577

    Transitions photochromic lenses use the (somewhat famously worded) "imbibed" technology. All of the Transitions photodye is contained in a very thin layer at the surface of the lens. So it is not hard to understand how the AR coatings would have the effect of sealing off the Transitions photodye from oxidation reactions, and thereby extending the service life of the lenses.

    I don't think that this observation about AR can be extended to the other photochromic lenses in the market, such as SunSensors and any of the other ones, because the technologies of fixing the photodye within the lens materials are different from product to product. And since the technologies are different, the other products may have different service life characteristics.

    Yours truly.

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