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  1. Replies
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    No, the location of the PRP must be within 1.0mm...

    No, the location of the PRP must be within 1.0mm vertically and 2.5mm laterally, of the location specified, if the prism induced exceeds 0.33 prism diopters (vertically) or 0.67 prism diopters...
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    Good point. In China, they call it "the A - D -...

    Good point. In China, they call it "the A - D - D", enunciating the letters. So, poor capitalization can have undesirable side-effects!
  3. The fact that the base curve is "-4.00" suggests...

    The fact that the base curve is "-4.00" suggests that this is a plus-cylinder configuration, with a toric surface on the front, and a concave sphere on the back (NOT your normal configuration these...
  4. R.i.p. 6,089,713

    R.i.p. 6,089,713
  5. Thread: CIRC3D in DCS

    by shanbaum
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    Your first question appears to be about the use...

    Your first question appears to be about the use of an implied circumference difference between two sides of a tracer's packet when one side is sent together with two circumference values. Note that...
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    Yes - I think it would have to be zero, as would...

    Yes - I think it would have to be zero, as would Rx prism (or a ray couldn't be normal to the PRP). Now, I am thinking that "normal to the PRP" implies "normal, cx and cc."
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    Why not?

    Why not?
  8. Replies
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    How about, if a ray normal to the PRP is...

    How about, if a ray normal to the PRP is coincident with the wearer's optical axis?
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    Old, but...

    I'm still alive.
  10. Replies
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    Tracers have gotten better over the years -...

    Tracers have gotten better over the years - current models do a good job of measuring frames accurately.
  11. There are several aspects to antitrust law; one...

    There are several aspects to antitrust law; one is whether an entity exercises "market power", which a monopoly can do ("market power" meaning it can set prices arbitrarily without being concerned...
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    No, the merger has not yet transpired; it's...

    No, the merger has not yet transpired; it's subject to stockholder and regulatory approval, neither of which has occurred.
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    All the layers of corporations, foreign and...

    All the layers of corporations, foreign and domestic, really don't matter; the merger will be scrutinized by the DOJ and FTC, and a raft of regulators around the globe. Just don't expect them to do...
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    I wrote this on ODs on Facebook in response to...

    I wrote this on ODs on Facebook in response to similar posts:

    Federal and state law applies to companies under their respective jurisdictions, and domicile is not necessary for jurisdiction. U.S....
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    Rodenstock designs are available from EGMA.

    Rodenstock designs are available from EGMA.
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    That is an astonishing rule, for which there can...

    That is an astonishing rule, for which there can be no sensible justification. Your reaction is entirely reasonable.
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    Eleven years goes by in a flash. I presume...

    Eleven years goes by in a flash.

    I presume you're looking to measure the curve of an aspheric blank for the purpose of calculating power; for aspheric lenses, you'd want a rather small bell...
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    Thanks! Conference on Europa...

    Thanks! Conference on Europa...
  19. Replies
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    Lest the information posted here mislead anyone,...

    Lest the information posted here mislead anyone, anyone delivering eyeglasses with polycarbonate lenses into California at wholesale or retail needs to familiarize himself with the proper actions to...
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    Just click on the image about 9 posts up ^^.

    Just click on the image about 9 posts up ^^.
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    There's no shortage of information about the...

    There's no shortage of information about the structure of both the Vision Council and the American National Standards Institute (another non-profit corporation) on their respective websites.
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    Surprise! The Vision Council is a non-profit...

    Surprise! The Vision Council is a non-profit corporation. Its primary sources of revenue are trade shows and membership dues. It's the US optical industry trade association - what's not clear?
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    ANSI appoints a "secretariat" for each of its...

    ANSI appoints a "secretariat" for each of its accredited standards committees ("ASC") and for Z80, it's the Vision Council. It used to be the Optical Laboratories Association, which merged with TVC...
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    Our booth was very busy on Thursday and Friday,...

    Our booth was very busy on Thursday and Friday, but Saturday was rather quiet.
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    If the tracer allows you to do that, it is not...

    If the tracer allows you to do that, it is not doing it in a standard way, because the standard provides no way to do it. I recommend pushing the button.
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