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  1. Replies
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    America - Moon Song 1975 ...

    America - Moon Song 1975


    https://www.youtube.com/watch?v=kF8yFkzRoYE

    Get Back documentary starts thanksgiving day on Disney+.

    https://www.youtube.com/watch?v=Fw71ucAUi2U
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    Diana Ross - Ninety-Nine and a Half 1987 ...

    Diana Ross - Ninety-Nine and a Half 1987


    https://www.youtube.com/watch?v=CrtQs88JWyI
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    1/2 is ok if you dare, although it might make...

    1/2 is ok if you dare, although it might make sense for very high cylinder values.

    Don't use a degree sign ˚ at the end.

    Hope this helps,

    Robert Martellaro
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    It's not that they're old- there was just so much...

    It's not that they're old- there was just so much happening in the mid-twentieth century music-wise, so much to explore, similar to what happened with classical music from the late 18th to 19th...
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    https://www.youtube.com/watch?v=j8VcpmpN0NM

    https://www.youtube.com/watch?v=j8VcpmpN0NM
  6. Beautiful. I hope the three Os are paying...

    Beautiful. I hope the three Os are paying attention.

    I think many folks confuse eye strain with poor ergonomics resulting in muscular and nerve irritation, with some of that due to improper lens...
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    Mark Peterson - Fugue in F minor "The Munster" ...

    Mark Peterson - Fugue in F minor "The Munster"


    https://www.youtube.com/watch?v=cRRrUmQMfv8

    Student Loan String Band - Munsters Theme Song


    https://www.youtube.com/watch?v=zAKCMiiY3Cw
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    Pete Seeger - Way Out There 1963 ...

    Pete Seeger - Way Out There 1963


    https://www.youtube.com/watch?v=dwe2pUI6P5E
  9. Using a flatter than 'best form' base curve is...

    Using a flatter than 'best form' base curve is one way to introduce oblique astigmatism and power error- introducing asphericity can clean up those errors.

    From Darryl Meister's 'Ophthalmic Lens...
  10. The difference in thickness due strictly to...

    The difference in thickness due strictly to refractive index is roughly equal to the ratio (1.60 - 1.00) / (1.56 - 1.00) = 0.93, or 7% thinner.

    We won't use finished blanks for plus hence the...
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    John Lennon - Mother 1972 ...

    John Lennon - Mother 1972


    https://www.youtube.com/watch?v=mwTJdibgh9k&list=RDmwTJdibgh9k&index=1
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    Welcome to OB. I hope you have a short and...

    Welcome to OB.

    I hope you have a short and full recovery.

    The calculators on OB were written by Darryl Meister.

    https://www.2020mag.com/article/remembering-darryl-meister

    He used more...
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    Welcome to OB. As mentioned above, a slab-off...

    Welcome to OB.

    As mentioned above, a slab-off prism can sometimes be used to correct prescribed vertical prism at near only, or more commonly, for imbalance at near due to anisometropia. Not...
  14. Odds are you just put a pretty big smile on our...

    Odds are you just put a pretty big smile on our host's face.

    Although I just retired, I plan on sticking around for the same reason, and to keep me honest.

    Best regards,

    Robert Martellaro
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    Early 21st century PAL maps.

    Early 21st century PAL maps.
  16. https://www.aao.org/eye-health/tips-prevention/are...

    https://www.aao.org/eye-health/tips-prevention/are-computer-glasses-worth-it

    I recommend wearing optimally fitted and designed eyeglasses derived from an up-to-date Rx, as needed.

    Best...
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    The Jimi Hendrix Experience - Purple Haze...

    The Jimi Hendrix Experience - Purple Haze 03-02-1967

    Recorded by the Beat Club at the Marquee Cub in London shortly after it was recorded in the studio, and then released as a single in the UK a...
  18. Many cat sx clients haven't had normal retinal...

    Many cat sx clients haven't had normal retinal illuminations levels for years. Expect significant adaptation periods, possibly related to unwanted artifacts from the lens implant.

    The sun is...
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    Viewing Zone Configuration Unlike lined...

    Viewing Zone Configuration

    Unlike lined multifocals, the central viewing zones of a progressive lens are not well-defined. The size and utility of the viewing zone will vary depending upon both...
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    Badfinger - Sweet Tuesday Morning 1972 ...

    Badfinger - Sweet Tuesday Morning 1972


    https://www.youtube.com/watch?v=fXE-u8ILjOU
  21. Get off my lawn? I don't drive a classic Gran...

    Get off my lawn? I don't drive a classic Gran Torino, but I do like the kids in my neighborhood, the parents not so much.

    A buddy of mine and his new girlfriend dragged me into a very popular...
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    Doors - In The Eye Of The Sun 1972 Pure Mind....

    Doors - In The Eye Of The Sun 1972

    Pure Mind.


    https://www.youtube.com/watch?v=7wHngnTYuAo

    Manzarek had plenty of practice singing Morrison's parts in concert when he was too drunk to go on.
  23. Although OA is an aberration that causes blur...

    Although OA is an aberration that causes blur towards the periphery of the lens, in this instance we are talking about 'unwanted surface astigmatism' that without exception, can be found around the...
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    Two ducks are walking down the road. One of the...

    Two ducks are walking down the road. One of the ducks says "quack". The other duck says: "OMG, I was going to say the same thing!"
  25. They can't. But then these are not general...

    They can't. But then these are not general purpose PALs- the distance has about +0.75 D of the add power, reducing by the same amount the degree of progressivity, reducing the unwanted astigmatism...
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