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Thread: Blue light blocking lenses

  1. #1
    Master OptiBoarder OptiBoard Bronze Supporter LENNY's Avatar
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    Blue light blocking lenses

    I found in my basement some nice 75mm -7.25sph and -8.25sph plastic lenses. They seem to be quite yellow.

    Can I sell them as blue light blocking lenses?

  2. #2
    Manuf. Lens Surface Treatments OptiBoard Gold Supporter
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    .................could also be just old CR39 lenses made in the old days.

    Have some of them too.
    Chris Ryser
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    http://optochemicals.com............................. http://arcoatings.com

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    Master OptiBoarder
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    Think that's what he meant Chris

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    Ghost in the OptiMachine OptiBoard Silver Supporter Quince's Avatar
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    Sure. No one can agree on research findings or where or not it is hogwash, so why not?
    Have I told you today how much I hate poly?

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    Manuf. Lens Surface Treatments OptiBoard Gold Supporter
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    Quote Originally Posted by Robert_S View Post

    Think that's what he meant Chris

    In the 1970s which was the start of commercial CR39 some manufacturers did not add any UV absorbers to the monomer and those lenses turned yellowish very fast.
    Chris Ryser
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    DLO. NA.IC.I.T.PO

    http://optochemicals.com............................. http://arcoatings.com

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    Master OptiBoarder rbaker's Avatar
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    The first CR-39 ophthalmic lenses were produced and marketed by Armorlite in 1947:

    http://www.opticalheritagemuseum.org...rliteStory.pdf

    More good historical info here:

    http://www.opticalheritagemuseum.org...erialsCR39.htm

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    Master OptiBoarder AngeHamm's Avatar
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    I'm Andrew Hamm and I approve this message.

  8. #8
    Manuf. Lens Surface Treatments OptiBoard Gold Supporter
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    Redhot Jumper .............and they scratched

    Quote Originally Posted by rbaker View Post

    The first CR-39 ophthalmic lenses were produced and marketed by Armorlite in 1947:


    .............and they scratched like hell and we had to hand polish them and make waves in them.
    Chris Ryser
    ________________________________________
    DLO. NA.IC.I.T.PO

    http://optochemicals.com............................. http://arcoatings.com

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