Search:

Type: Posts; User: drk; Keyword(s):

Page 1 of 20 1 2 3 4

Search: Search took 0.10 seconds; generated 36 minute(s) ago.

  1. Replies
    22
    Views
    597

    Some great discussion here. Thank you.

    Some great discussion here. Thank you.
  2. Replies
    22
    Views
    597

    Ultimately, we have positioned it as a tint, or...

    Ultimately, we have positioned it as a tint, or the old-style UV coating. We will use AR with it (as we should on virtually all lenses.)

    In the end, with our fee schedule, the patient pays a...
  3. Replies
    22
    Views
    597

    I'm now under the impression that the "invisible"...

    I'm now under the impression that the "invisible" blue blocking is probably imbibed on the front surface like photochromics, and there are treated blanks that are required.
  4. Replies
    22
    Views
    597

    Examples of "in mass"...

    Examples of "in mass"
    https://www.zeiss.com/vision-care/us/need-new-eyeglasses/blueguard.html
    https://shamir.com/for-professionals/lenses_and_more/shamir-blue-zero/...
  5. Replies
    22
    Views
    597

    Navigating the blue light protection scam

    Blue light protection is a scam. In all my many years I've never seen such a delusion take hold. It speaks to the "disinformation age" in which we find ourselves. (Editorial comment.)

    1. Blue...
  6. Replies
    5
    Views
    303

    Beer goggles.

    Beer goggles.
  7. Thread: Omnilux....

    by drk
    Replies
    10
    Views
    453

    Thank you Uilleann. It's "just" a inverted...

    Thank you Uilleann.

    It's "just" a inverted triangle design. It seems those designs are intermediate-optimized.

    If the near zone is wide enough, I guess it would work for general purpose.
  8. Thread: Any insights

    by drk
    Replies
    7
    Views
    464

    If you can get into a good OD school, and you are...

    If you can get into a good OD school, and you are willing to consider different places to live, and you don't go into too much debt, it's still a good profession.
  9. Problem #1 is monocular PALs. What the fresh...

    Problem #1 is monocular PALs. What the fresh hell is that?

    Problem #2 is first time PALs with a full add. That's always hard.

    Your best bet would be just segmented BF with equal BC and CT. ...
  10. Thread: Nystagmus fitting

    by drk
    Replies
    6
    Views
    407

    Good questions. First lens design. I would...

    Good questions.

    First lens design. I would agree that a wider, more prominent seg is smart.


    Re: centering the optics...
    a. If high power lens, it's for the better central optics.
    b. I...
  11. Replies
    35
    Views
    1,249

    https://encrypted-tbn0.gstatic.com/images?q=tbn:AN...

    https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcSfuU6rSXa3RcjaeNANrtjSHgczBEM00OLiZ74CsxgjNea4QlzAkCZmPFvabLXcc0POVNk&usqp=CAU
  12. Replies
    35
    Views
    1,249

    Another take-home point is that we don't have to...

    Another take-home point is that we don't have to worry about the prism amounts that are used for the typical phoric conditions (2^ BI, etc.). But for the mega-prism situations (shudder) like 6^BO...
  13. Replies
    35
    Views
    1,249

    The synthesis: Poly, while a good low-power...

    The synthesis:

    Poly, while a good low-power lens material, is not as good for higher powers due to chromatic aberration, especially for higher plus powers, where trivex will do better, visually.
    ...
  14. Replies
    35
    Views
    1,249

    ... we see for a poly lens with Abbe of 30,...

    ... we see for a poly lens with Abbe of 30, powers of +4 and above have lateral color errors of more than twice that of our 0.12 threshold...At those levels, some observers would find it bothersome. ...
  15. Replies
    35
    Views
    1,249

    Plus Vs. Minus Powered Lenses plus lenses yield...

    Plus Vs. Minus Powered Lenses
    plus lenses yield more lateral chromatic aberration than minus lenses of identical power.

    This is because of the front surface curvature and thickness of the lens,...
  16. Replies
    35
    Views
    1,249

    Just Observable Error For Lateral Color “ we...

    Just Observable Error For Lateral Color

    “ we know that 5 Diopters of prism introduces enough lateral color to cause about the same amount of blur as does 0.12 diopters of power error…

    There is...
  17. Replies
    35
    Views
    1,249

    https://www.2020mag.com/CMSImagesContent/2015/9/Re...

    https://www.2020mag.com/CMSImagesContent/2015/9/Refractice-Index-chart-for-Poly_web.png

    "The outlier"
  18. Replies
    35
    Views
    1,249

    https://www.2020mag.com/CMSImagesContent/2015/9/Le...

    https://www.2020mag.com/CMSImagesContent/2015/9/Lens-Material-Chart---Dick-Whitney_web.png
  19. Replies
    35
    Views
    1,249

    https://www.2020mag.com/article/does-material-abbe...

    https://www.2020mag.com/article/does-material-abbe-value-influence-your-patients-vision
  20. Replies
    2
    Views
    1,846

    It sounds unlikely to me that it has anything to...

    It sounds unlikely to me that it has anything to do with corneal curvature.

    Optimized for hyperopes probably has to do with the softness feature.

    Intended for CL wearers is baffling. Maybe...
  21. (No experience to contribute, sorry.)

    (No experience to contribute, sorry.)
  22. I don't think that's likely. And I don't know...

    I don't think that's likely. And I don't know how a patient would be able to legitimately say "Oh, I KNOW I saw better through the doctor's thing-a-ma-jobby than through these coke-bottles!"

    I...
  23. Replies
    6
    Views
    2,638

    Traditional numbers say 8 exams x 5 days x 50...

    Traditional numbers say 8 exams x 5 days x 50 weeks = 2000/yr

    Need about 6000 for a good patient base.
  24. I have Welch-Allen and it's boring and standard. ...

    I have Welch-Allen and it's boring and standard. I'm very happy with it.
  25. "Seeing better in the chair" is sometimes an...

    "Seeing better in the chair" is sometimes an unavoidable situation. How small are phoroptor lenses? 20 mm? And glass.
Results 1 to 25 of 500
Page 1 of 20 1 2 3 4