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Thread: Progressive lenses producing color at object borders...

  1. 02-21-2013, 12:53 PM #1
    Uncle Fester
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    Progressive lenses producing color at object borders...

    Here's a test that probably was touched on in previous threads but let's see who comes up with the first correct answer...

    Old Rx
    R 0.00 -1.00 x90
    L +.25 -1.25 x 65
    add +2.25

    New Rx
    R +.75 -1.25 x92
    L +.75 -1.25 x73
    add +2.25

    Both lenses Genesis poly no ar same height and pd same lab-- bc +5.25 ou same wrap and panto.

    When looking through the distance and held up to a distant image in this case a black poster on a white wall a distinct thin orange line appears between them on only the new pair.

    What caused it?
    Last edited by Uncle Fester; 02-21-2013 at 01:06 PM.
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  2. 02-21-2013, 01:54 PM #2
    Robert Martellaro
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    Yoked base-down prism for thinning on pair #2 that wasn't present on pair #1?
    Science is a way of trying not to fool yourself. - Richard P. Feynman

    Experience is the hardest teacher. She gives the test before the lesson.


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  3. 02-21-2013, 02:11 PM #3
    Uncle Fester
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    I knew I should have disqualified some of you!
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  4. 02-21-2013, 02:20 PM #4
    optical24/7
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    Edge polish on 2nd pair?
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  5. 02-21-2013, 02:21 PM #5
    optical24/7
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    So prism thinning is the reason?
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  6. 02-21-2013, 03:02 PM #6
    Uncle Fester
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    Quote Originally Posted by optical24/7 View Post
    So prism thinning is the reason?
    I believe it will prove to be so!

    This is the kind of incident that many of us assume to be a picky patient but when I looked through each pair sure enough the color refringence was quite visible. The patients a graphic designer who's on a computer all day so you can imagine the last few days of frustration as it was dispensed with a "try it for a few days".
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  7. 02-21-2013, 03:14 PM #7
    Wes
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    Quote Originally Posted by Robert Martellaro View Post
    Yoked base-down prism for thinning on pair #2 that wasn't present on pair #1?
    That was my guess too. It's often easily visible in a lensometer.
    Wesley S. Scott, MBA, MIS, ABOM, NCLE-AC, LDO - SC & GA

    “As our circle of knowledge expands, so does the circumference of darkness surrounding it.” -Albert Einstein
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  8. 02-21-2013, 04:02 PM #8
    kentmitchell1961
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    Had this in a PT a while ago, it was the Poly itself that was the issue put hiim in cr-39 and problem vanished..... Oh and had blue outline on the horizontal edges...
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  9. 02-21-2013, 05:50 PM #9
    optical24/7
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    Fester, was the edge polished? This can exasperate (make more noticeable ) poly's CA.
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  10. 02-21-2013, 06:32 PM #10
    Uncle Fester
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    Yes. But the old pairs were as well so I'm betting it's the prism thinning.

    There's not a lot of thickness to these lenses.
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  11. 02-21-2013, 07:31 PM #11
    Robert Martellaro
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    Quote Originally Posted by Uncle Fester View Post
    There's not a lot of thickness to these lenses.
    But not a lot of prism also, what, a buck and a half? Could a coating anomaly be a contributer?
    Science is a way of trying not to fool yourself. - Richard P. Feynman

    Experience is the hardest teacher. She gives the test before the lesson.


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  12. 02-22-2013, 09:04 AM #12
    Uncle Fester
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    A full 2^ down ou.

    Old pair zero.
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  13. 02-22-2013, 09:54 AM #13
    Randle Tibbs, ABOM
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    Quote Originally Posted by Uncle Fester View Post
    A full 2^ down ou.

    Old pair zero.
    Isn't 2D a bit much for that add? I agree with Robert and I don't think CA would be an issue with that Rx.

    Randle
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