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Thread: Lensmeter questions

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    Lensmeter questions

    Doctors just gave me an old Marco 101 to have. It is not calibrated and needs some work to be done. I tried looking through the forums because I thought I remembered someone re-wiring their lensmeter and putting in a new light but I couldn't find the post. Anyone got any information on how to take it apart to try and work on it?

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    Master OptiBoarder rbaker's Avatar
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    All of the electrical components can be purchased from your local electrical supply house. If you are lacking in the skills to do the repair yourself any appliance repair guy or electrician will do it for you. Its no big deal.

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    I'll go ahead and try that. Any ideas on if it's worth trying to re calibrate myself. I mean, it doesn't work right now, so can I really make it that much worse trying to work on it by myself?

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    What is wrong with the calibration? Is it just that the axis is showing a little off, or the prism compensator and power wheels are way off?

    First one is a relatively easy fix, second one... you'd be a braver man than me

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    The axis is a little off, but the prism compensator is definitely off.

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    Quote Originally Posted by bta89 View Post
    The axis is a little off, but the prism compensator is definitely off.
    On old Burton 2021 I was able to just rotate the faceplate of the axis wheel to align it correctly, I actually just realized I don't know if you can do that on my Marco 101.

    The prism compensators... I think they are very tricky.

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    Ghost in the OptiMachine Quince's Avatar
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    I'm quite jealous. I would love to have a Marco to toy with. Mine is in good condition, so I leave it right alone, but it would be fun to have the chance to not worry about messing one up. Good luck!
    Have I told you today how much I hate poly?

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    hello guys, i have question about measuring prism lens using digital lensmeter. everything looks good until i'm measuring prism lens with plus diopter. Why the cross position different with prism with plano or minus lens. let's say with +2.00 4 prism BO showed the opposite position of -2.00 4 prism BO or PL 4 prism BO.
    Did the result is the same with manual lensmeter?
    thanks

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    One eye sees, the other feels OptiBoard Silver Supporter
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    Quote Originally Posted by redb View Post
    hello guys, i have question about measuring prism lens using digital lensmeter. everything looks good until i'm measuring prism lens with plus diopter. Why the cross position different with prism with plano or minus lens. let's say with +2.00 4 prism BO showed the opposite position of -2.00 4 prism BO or PL 4 prism BO.
    Did the result is the same with manual lensmeter?
    thanks
    redb,

    Measure for prism at the PRP (Prism Reference Point). That will eliminate errors from improper positioning, resulting in induced prism when there is dioptric power in the meridian in question. The PRP is the wearer's PD.

    I've never used a digital lensmeter but it might be as simple as entering the PD. On a manual, transfer the PD to the eyeglass lenses with a progressive lens centering chart, centering each lens on the lens stop.

    Hope this helps,

    Robert Martellaro
    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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    Quote Originally Posted by Robert Martellaro View Post
    redb,

    Measure for prism at the PRP (Prism Reference Point). That will eliminate errors from improper positioning, resulting in induced prism when there is dioptric power in the meridian in question. The PRP is the wearer's PD.

    I've never used a digital lensmeter but it might be as simple as entering the PD. On a manual, transfer the PD to the eyeglass lenses with a progressive lens centering chart, centering each lens on the lens stop.

    Hope this helps,

    Robert Martellaro
    Click image for larger version. 

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ID:	14148this is without +2.00 (prism only). with base in the left, the cross position looks normal moved to right
    Click image for larger version. 

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    this is prism 4 with +2.00. same base position with first picture. The cross on the screen moved to left now.
    Why that happen?

  11. #11
    One eye sees, the other feels OptiBoard Silver Supporter
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    Quote Originally Posted by redb View Post
    Click image for larger version. 

Name:	IMG_20181130_134138[1].jpg 
Views:	16 
Size:	21.4 KB 
ID:	14148this is without +2.00 (prism only). with base in the left, the cross position looks normal moved to right
    Click image for larger version. 

Name:	IMG_20181130_134417 - Copy.jpg 
Views:	18 
Size:	24.3 KB 
ID:	14149
    this is prism 4 with +2.00. same base position with first picture. The cross on the screen moved to left now.
    Why that happen?
    redb,

    I have no experience with autos, only manual, but I suspect that the instrument is assuming that the second measurement is for the fellow eye. Try taking the R/L setting off auto and see what happens.

    Best regards,

    Robert
    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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