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Thread: patient seeing blue

  1. #1
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    patient seeing blue

    I made 3 pairs of glasses for a patient. 2 proggesives and 1 reading. pt has no complaints with the proggesives. When he picked up the reading glasses he feels like half of the words are shaded blue.
    Originally did poly with avance. sent the lenses back to the lab and they say there is no defects. i redid the lenses in 1.67 avance and he still sees the same thing. has anybody ever heard of this complaint????
    The protective coating was removed after edging.

    Rx +4.00-1.00x95
    +4.00-1.00x90

  2. #2
    Doh! braheem24's Avatar
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    lower the OC, or lay off the viagra. Both will make you see blue.

    PS, to clarify (Do not lower seg, only O.C.) and the Viagra comment was not a joke either, It is a medical condition and can cause people to see blue, but not in this case :)

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    Sounds like early cataracts, obviously.

  4. #4
    What's up? drk's Avatar
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    Is it possible that this is NOT a consumer? Please tell me "no".

  5. #5
    Doh! braheem24's Avatar
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    Better stop selling glasses that cause cataracts, that's a major lawsuit.

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    Doh! braheem24's Avatar
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    Quote Originally Posted by drk View Post
    Is it possible that this is NOT a consumer? Please tell me "no".
    "NO" now get back on your meds.

  7. #7
    What's up? drk's Avatar
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    Ok, I checked out his posts. He seems like an optician.

    Let's play "hangman"! Two words:

    _ _ _ _ _ _ _ _ _

    _ _ _ _ _ _ _ _ _ _

    Who wants to give me a letter?

  8. #8
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    Vanna, can I have an "E"?

  9. #9
    One eye sees, the other feels OptiBoard Silver Supporter
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    Quote Originally Posted by drk View Post
    ok, i checked out his posts. He seems like an optician.

    Let's play "hangman"! Two words:

    _ _ _ _ _ _ _ _ _

    _ _ _ _ _ _ _ _ _ _

    who wants to give me a letter?
    R, but it's cruel.
    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.



  10. #10
    What's up? drk's Avatar
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    _ _ r _ _ _ _ _ _

    _ _ e r r _ _ _ _ _

    Didn't mean to be cruel. Having fun, but maybe not

  11. #11
    What's up? drk's Avatar
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    Sorry, fs.

    Polycarbonate and 1.67 are plagued with high chromatic aberration.

    A nice aspheric, mid-index lens like Spectralite or aspheric Trivex would be just dandy for that Rx.

  12. #12
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    Never mind...

  13. #13
    One eye sees, the other feels OptiBoard Silver Supporter
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    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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    OptiBoard Professional ERHALT1's Avatar
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    I would say play with the OC also DRK QUOTE:(Polycarbonate and 1.67 are plagued with high chromatic aberration.

    A nice aspheric, mid-index lens like Spectralite or aspheric Trivex would be just dandy for that Rx.) Keep In mind that some patients will see things that will never be explained!
    Grateful to be what I am, and not pretending to be someone I am not!

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    Eyes eastward... Uilleann's Avatar
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    @ drk. No offense taken.
    I told the patient to take the glasses and try it for a week and if it still blue ill change it out again. I ended up doing stock lenses for both times I did the glasses. If I do it again I'll probably surface the lenses,do trivex and change OC. I just found it strange that in 8 years of being in the field, this is the first time of hearing this complaint. I guess there's a first for everything

  17. #17
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    Quote Originally Posted by drk View Post
    Sorry, fs.

    Polycarbonate and 1.67 are plagued with high chromatic aberration.

    A nice aspheric, mid-index lens like Spectralite or aspheric Trivex would be just dandy for that Rx.
    I was gonna say, poly?

  18. #18
    What's up? drk's Avatar
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    Here's a question that I don't know the answer to:

    If you were to go from spherical poly to aspheric poly, would the decrease in thickness help the chromatic aberration?

    I'm thinking not, because surely the 1.67 was an aspheric lens, and the patient was still seeing the fringes.

  19. #19
    Doh! braheem24's Avatar
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    Sure it would, Aspheric means less Rx in the perimeter of the lens. Less Rx = Less prism, Less prism = Less light breakup.

    Real question is, are they looking through the aspheric point to make a difference?

  20. #20
    One eye sees, the other feels OptiBoard Silver Supporter
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    Quote Originally Posted by drk View Post
    Here's a question that I don't know the answer to:

    If you were to go from spherical poly to aspheric poly, would the decrease in thickness help the chromatic aberration?
    No. Lateral chromatic aberration = Prism / Abbe. The prism may be induced and/or prescribed. Less LCA requires a shorter vertex distance, optimal positioning of the OC for less induced prism (this may increase power error and oblique astigmatism, but more advanced lenses can give you the best of both worlds), and a lens material with a higher Abbe value. Some folks are more sensitive than others, so look at their history, and err on the side of caution.
    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.



  21. #21
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    Chromatic Abberation.. I am guessing the otherside has a little bit of "yellow" finging as well.

    I would recommend Aspheric 1.60 for this patient, 42 Abbe is only hair behind trivex, but its better suited to the RX.

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    Why is the singular response chromatic abberration with respect to the lenses??? Curious if there are no other potential causes, ....... at first blush (and maybe last) the lens power seems too low to be driving the color shift independently - which also influences the amount of potentially induced prism ...... The non-readers were presumable unaffected by the perceived anomaly.
    Trip

  23. #23
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    Why? Because blue is the color most often seen with chromatic aberration. Somewhere on the board here is a wonderful article on it, complete with color focus charts explaining in very good detail how it happens.

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