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  1. Replies
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    Hi As a German refracting optician it is...

    Hi
    As a German refracting optician it is unlikely that you would get registration as an optometrist in any of the Australian states. As for optical dispensing, there is now only licensing in one...
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    John, Fannin and Gosvenor take the same approach...

    John,
    Fannin and Gosvenor take the same approach as you. My problem with that theory is that you have the light reflecting at the first surface of the coating AND interfering with the incoming...
  3. Yes, Mirage2k2. The aim is to get the principal...

    Yes, Mirage2k2. The aim is to get the principal axis to pass through the centre of rotation of the eye. Laurie's method is the best at achieving this. All single vision lenses should theoretically be...
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    [QUOTE=Jacqui]Those are rediculous. QUOTE] ...

    [QUOTE=Jacqui]Those are rediculous. QUOTE]

    Not really. They may seem ridiculous but only because they don't agree with our perceptions of what is correct. Have a look at the article written by...
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    14,388

    Darryl has written an excellent article on...

    Darryl has written an excellent article on atorics. You'll find it in the OptiBoard files. Essentially, an aspheric surface is used to reduce the effects of aberrations, notable oblique astigmatism,...
  6. I see your point William, but it is really no...

    I see your point William, but it is really no different to adjusting power to suit a different back vertex distance. We have been doing that for decades (or should have been for high powers) and I...
  7. Replies
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    Yes, this is important. In addition, though, if...

    Yes, this is important. In addition, though, if there is ordered prism then you must decentre the optical centre 0.25mm towards the apex for every prism dioptre. So if 2 prism dioptres base out is...
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    11,151

    No, the 27mm includes an assumed back vetex...

    No, the 27mm includes an assumed back vetex distance of 12mm plus the distance from the pole of the cornea to the centre of rotation of the eye of 15mm.

    Regards
    David
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    My pleasure Frayli. Good luck. Hi drk, yes,...

    My pleasure Frayli. Good luck.

    Hi drk, yes, the SolaOne is a back surface prog (at least in Australia), but only in its 1.67 material.

    Regards
    David
  10. Replies
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    11,151

    Both Rodenstock and Zeiss produce little tools to...

    Both Rodenstock and Zeiss produce little tools to measure tilt. I suspect that this may be what you have Chip. Zeiss's gauge is a little square plastic plate with a needle weighted on one end. The...
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    Hi Frayli, SolaOne is one of the new breed of...

    Hi Frayli,
    SolaOne is one of the new breed of 'As Worn' lens designs. It follows principles similar to those used by Rodenstock with their Impression ILT and Zeiss with their individual. These...
  12. Replies
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    You haven't, Clive. All of the lens...

    You haven't, Clive. All of the lens manufactureres and their designers (and Darryl) are saying to fit at pupil centre. The vast majority of practitioners around the world fit at pupil centre and all...
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    5,141

    Robert is right, some Aussies do use this method,...

    Robert is right, some Aussies do use this method, and I agree with Robert's views on it. We are trying to convert those who have strayed from the path. and you can be sure it is not taught that way...
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    Just adding to what Darryl has said, you would...

    Just adding to what Darryl has said, you would also need to put the standard lens in a different position. The lens rest aperture should be at the second principal focus of the standard lens.

    ...
  15. Your right Jim. Peter Wilkinson did do research...

    Your right Jim. Peter Wilkinson did do research into which wavelengths flicker and, therefore, how we can eliminate them with tints. He mentions his research in an article published in Dispensing...
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    Following up from Robert's comments. Dan...

    Following up from Robert's comments. Dan Torgerson wrote a very good paper a few years back in which he says that when TCA reachers 0.16 the acuity drops one line. From memory, he also calculated TCA...
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    Hi Roy, Nice to hear from you. We actually met...

    Hi Roy,
    Nice to hear from you. We actually met many years ago when you were down here in Sydney. I agree with Darryl's comments, and that is essentially how our standards are framed too. I am on the...
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    Hi Gavin, As Laurie says, we now use the boxing...

    Hi Gavin,
    As Laurie says, we now use the boxing system. The datum system uses the same top and bottom tangents to the lens (the top and bottom of the box) but eyesize and bridge (DBL) are made on...
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    Hi Nellie, Have you spoken to your teachers? I...

    Hi Nellie,

    Have you spoken to your teachers? I am sure that they would be happy to give you some help.
    Some things to consider are, that a ring-of-dots focimeter has no axis drum and so it can be...
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    Hi Chip, I think that Terry and Darryl are on...

    Hi Chip,
    I think that Terry and Darryl are on the right track here. These are reflections, not aberrations. Also, I'm curious about the saying, "PAL's are not to be used on presbyopes who are...
  21. Replies
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    Poll: I guess it depends on your definition of hockey...

    I guess it depends on your definition of hockey bend, however I have always subscibed to the fitting method advocated by two very highly respected 'oldies' (I'm sure that they will pardon the...
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    Hi Jo, Yellow specs were often referred to as...

    Hi Jo,
    Yellow specs were often referred to as night driving glasses (here in Australia at least). They are more correctly 'contrast filters' and were originally recommended for dusk conditions where...
  23. Thread: Signs

    by David Wilson
    Replies
    26
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    5,248

    On an optician's window, "We dispense with...

    On an optician's window, "We dispense with accuracy"

    On a dry cleaner's window, " We don't tear your clothing with machinery. We do it carefully by hand"

    At a used car yard, "Don't go elsewhere...
  24. Hi Alan, As I understand it there is one...

    Hi Alan,
    As I understand it there is one university in England that now offers opticians a conversioncourse to become optometrists. They must have the FBDO (CL) qualification to enrol. It is a...
  25. International Opticians in in Soutrh Africa

    Just back from the International Opticians' Association meeting in Cape Town, South Africa. It was all I expected and up to the usual high standard of the association. Congratulation to the past...
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