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  1. Replies
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    Sam and Dave - I Take What I Want 1966 ...

    Sam and Dave - I Take What I Want 1966


    https://www.youtube.com/watch?v=sdu9_dMFMwE
  2. Yes, Rodenstock made two versions. Pictured, with...

    Yes, Rodenstock made two versions. Pictured, with instructions, on page 6 and 7 of the David Wilson link above. Prof. Wilson used to post on Optiboard.

    Harry, I hope your having fun and getting...
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    Bob Wills and The Texas Playboys - Take Me Back...

    Bob Wills and The Texas Playboys - Take Me Back To Tulsa 1960


    https://www.youtube.com/watch?v=U-4IAEjIP3k
  4. “In response to poor fitting in the form of tilt...

    “In response to poor fitting in the form of tilt or decentration, lenses with aspheric form surfaces were found to have greater off-axis power errors than best-form lenses with spherical surfaces.” ...
  5. Your welcome. I checked my blue bible...

    Your welcome. I checked my blue bible but the only reference to drop is for segment drop related to segmented multifocals. Surprising because that info is needed for a proper troubleshoot.

    Best...
  6. With segmented bifocals, the drop is the distance...

    With segmented bifocals, the drop is the distance from the 180 line to the top of the seg. I don't know the history of its use with PALs, but it is equal to the distance from the FC to the PRP/180...
  7. Definitely 100% in my area. The last time I saw a...

    Definitely 100% in my area. The last time I saw a vertex distance noted on an Rx (last week I dispensed a -17 PAL and a +14 SuperMod on the same day) was from a local MD about 10 years ago, and that...
  8. Where the change starts, the rate of change, and...

    Where the change starts, the rate of change, and corridor length are all independent of the drop. There are short corridor 4mm drops, and long corridors with 2mm drops.

    Wear the lens (yourself...
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    I heckled him for going commercial with "This...

    I heckled him for going commercial with "This Bud's For You", but loved his cover tunes of early to mid-century jazz artists.

    In this piece, one of America's greatest pianists is covered by one...
  10. The plate height (and sometimes bevel placement)...

    The plate height (and sometimes bevel placement) has the greatest influence on the vertex distance (see image below). I see this with iseikonic lenses when an increase in the base curve on a minus...
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    Not in healthy, adult eyes. Unwanted...

    Not in healthy, adult eyes.



    Unwanted base-down prism causes a floor or other flat surface to seem concave, and the patient feels like he or she is standing in the bottom of a depression....
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    Two dyslexics are in the kitchen. One says to the...

    Two dyslexics are in the kitchen. One says to the other, "Can you smell gas?"

    The other replies, "I can't even smell my own name."
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    Nazareth - Morning Dew 1972 In the End, we...

    Nazareth - Morning Dew 1972

    In the End, we will remember not the words of our enemies, but the silence of our friends. -Martin Luther King, Jr.


    https://www.youtube.com/watch?v=XLoB3vOqdL4
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    Hi Michelle, I'm filling RXs for FL-41 tints,...

    Hi Michelle,

    I'm filling RXs for FL-41 tints, typically combined with task eyeglasses, usually for computer monitors. Results vary, but most are experiencing some degree of relief.

    However,...
  15. My optical heart sinks like a rock in quicksand....

    My optical heart sinks like a rock in quicksand. I feel for you, but have little to offer but hopes and prayers.

    You will want to fix that.

    Hope this helps,

    Robert Martellaro
  16. Brain freeze! Too much vacation fun! Emerging...

    Brain freeze! Too much vacation fun!

    Emerging presbyopic hyperopes! I don't want to seem them until they're age 60.

    Robert
  17. The powers on the vertical meridian are OD -0.50...

    The powers on the vertical meridian are OD -0.50 D and OS +0.75 D, for a difference of 1.25 D. The Zeiss lens has a 6mm drop, inducing 0.75∆ of Vertical prism Imbalance Base Up OD (or BD OS) at the...
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    That may introduce errors, I think. If you move...

    That may introduce errors, I think. If you move more for one eye than the fellow eye we might change the binocular PD, which is arguably more important then the monocular PD. A simple rule of thumb...
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    For every 1mm diference between the PD of the...

    For every 1mm diference between the PD of the fitter and the subject, the fitter will over-estimate
    the subject's PD by 1/16 mm if the fitters PD is larger than that of the subject. -Probably Jalie....
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    Alfred, A Pupilometer is the standard, but is...

    Alfred,

    A Pupilometer is the standard, but is unable to account for face turns and other physical anomalies.
    ...
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    Eartha Kitt - I Want To Be Evil 1962 ...

    Eartha Kitt - I Want To Be Evil 1962


    https://www.youtube.com/watch?v=SS02GeKuWQ4
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    Santana - Treat 1968 Influential ...

    Santana - Treat 1968

    Influential


    https://www.youtube.com/watch?v=tRsVZAT5qF8
  23. The Varilux Comfort is generally a soft design,...

    The Varilux Comfort is generally a soft design, that is, soft at distance and intermediate, but somewhat harder at near. Most PAL designs use elements of both designs, possibly depending on the base...
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    Hi Randle, My middle-of-the-road...

    Hi Randle,

    My middle-of-the-road libertarianism explains the hint of sarcasm, but I'm serious about the subject, that is, it's acceptable practice to remove the Z87 designation as long as dress...
  25. A Myodisk might be the best for some folks,...

    A Myodisk might be the best for some folks, especially for RXs over 20 D, like this one.

    http://epiclabsinc.com/specialty-lenses/extreme-lenses/standard-myodisk/

    Avoid the blended versions....
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