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  1. I think the allowance for lid thickness is...

    I think the allowance for lid thickness is typically 1mm.

    B
  2. I would be OK with this scenario, and have made...

    I would be OK with this scenario, and have made the eyewear in accordance with the buyer’s dictates and recipe.

    But like prescribers, when the eyewear doesn't unfold as planned, they want me to...
  3. Best approach is reduce binocular rivalry by: ...

    Best approach is reduce binocular rivalry by:

    1. Frame Choice: Size and pupil placement
    2. Definitely Shaw lenses
    3. If some rivalry /binocular tension remains, consider the Commet approach and...
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    Methinks Fully clear applies as closely as...

    Methinks Fully clear applies as closely as “accurate measurements.”

    B
  5. Jury still out.

    Jury still out.
  6. Replies
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    544

    Everyone should read The Varilux Epic of of...

    Everyone should read The Varilux Epic of of respect.

    it’s available used on Amazon and as a pay-for PDF:
    ...
  7. Replies
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    754

    Because some shapes—aviators to name one—have...

    Because some shapes—aviators to name one—have something my Dad called “automatic decentration”—meaning the minimum blank size needed to just cut out included extra decentration from the mechanical...
  8. Replies
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    754

    Datum system, which was well suited for the then...

    Datum system, which was well suited for the then current 1930s symmetrical, non-gendered lens shapes and frame styles that predominated before the rise of asymmetrical female/harlequine and aviator...
  9. What does it matter? Harm? No. ”Digital...

    What does it matter?

    Harm? No.
    ”Digital Eyestrain” as it’s colloquially defined? No.

    Increased perception of wearer comfort? Absolutely yes!

    Be careful what you pronounce with authority. Or...
  10. The central problem with most acetate frame bevel...

    The central problem with most acetate frame bevel grooves is that the frame front is milled flat.
    Then frame wrap is introduced, effectively moving the frame’s rear bevel groove shoulder further...
  11. Replies
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    1,796

    tell use more

    tell use more
  12. Replies
    2
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    647

    Fea

    Fea
  13. In a counter intuitive way, often with poor...

    In a counter intuitive way, often with poor cosmetics—You coukd move the bevel apex extremely forward: This will often help avoid the splay.

    barry
  14. Replies
    4
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    716

    Look no further than TC Charton B

    Look no further than TC Charton

    B
  15. Replies
    7
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    1,277

    In the absence of coordinated, national optician...

    In the absence of coordinated, national optician licensure, the path forward is clear:

    1. Recognize the best/most important parts of legacy opticianry teaching
    2. Recognize the areas, such as...
  16. Replies
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    47,755

    Yes, Certainly YMMV. B

    Yes, Certainly YMMV.

    B
  17. Replies
    47
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    47,755

    As if the 15-17% overall remake is actually...

    As if the 15-17% overall remake is actually manageable or avoidable within today’s optical landscape.

    Respectfully, I see this as naive.

    B
  18. Because they’re bad of terrible quality...

    Because they’re bad of terrible quality materials. That’s why.

    B
  19. Replies
    5
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    1,045

    There’s nothing “right” about it according to...

    There’s nothing “right” about it according to Wollaston or Ostwalt.
    B
  20. Replies
    228
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    42,150

    Sounds goods. But I implied nothing about wearer...

    Sounds goods. But I implied nothing about wearer comfort. Just accuracy of positioning

    B
  21. Replies
    228
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    42,150

    If high accuracy is the goal, you’d never use a...

    If high accuracy is the goal, you’d never use a PD taken objectively with a ruler or via corneal reflection

    B
  22. Replies
    228
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    42,150

    But if they look in any direction except straight...

    But if they look in any direction except straight ahead, the consequences apply.

    Now what?
  23. Replies
    228
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    42,150

    Just what is so wrong with using a binocular PD?

    Just what is so wrong with using a binocular PD?
  24. Replies
    15
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    1,978

    The older datum system was a more effective guide...

    The older datum system was a more effective guide when fitting a frame.
    the boxing system was a lab answer to non symmetrical shapes in the age of limited blank diameters .
  25. Replies
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    561

    You must always balance Martin’s Rule against the...

    You must always balance Martin’s Rule against the impact of abbe when the panto is 8 degrees or more.

    B
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