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  1. Thread: Crizal Rock

    by Lensman11
    Replies
    65
    Views
    7,767

    It has been many years since alundum has become...

    It has been many years since alundum has become unavailable. It seems there is no desire to have a uniform standard to rate scratch resistance. This way each manufacturer can claim whatever they want...
  2. Thread: Crizal Rock

    by Lensman11
    Replies
    65
    Views
    7,767

    Do you know anything about this new test. The...

    Do you know anything about this new test. The abrasion agent (alundum) is no longer available for the Bayer test. Did they just introduce a new abrasion medium , if that is the case then the whole...
  3. Thread: Crizal Rock

    by Lensman11
    Replies
    65
    Views
    7,767

    Don’t get caught up in the hype. The sand test...

    Don’t get caught up in the hype. The sand test that measures scratch resistance shows it is no better than what is currently on the market. Remember 1+3=4 2+2=4 4+0=4 all that counts is the end...
  4. Replies
    12
    Views
    1,166

    Other than Poly you can tint before you spin coat...

    Other than Poly you can tint before you spin coat so the tintability of the coating doesn’t matter. When I was GM at Essilor Dallas we were spin coating with td2 the current dip coat material and...
  5. Thread: Crizal Rock

    by Lensman11
    Replies
    65
    Views
    7,767

    This appears to be another marketing driven...

    This appears to be another marketing driven product. There is nothing definitive about to warrant a higher cost. Six layers is the standard for high quality coating. Comparing to substrate match is...
  6. Replies
    12
    Views
    1,166

    You can add a tint to ar but it depends on the...

    You can add a tint to ar but it depends on the requirements of the ar. If you are spinning the hard coat no problem. Many sun lenses are pre colored material no problem, Polaroid no problem. If you...
  7. Replies
    12
    Views
    1,166

    They should have told you why. Most likely it is...

    They should have told you why. Most likely it is because when they hard coat the lens after tint some of the tint will leach out and spoil the dip coat.
  8. Thread: Clip ons!

    by Lensman11
    Replies
    21
    Views
    1,570

    The magnet in the clip has to be several mm in...

    The magnet in the clip has to be several mm in the edge so to attach to the frame you would have to make the clip much larger than the frame. That would detract from the appearance in addition the...
  9. Replies
    29
    Views
    1,909

    There is no free form generator that can handle...

    There is no free form generator that can handle that amount of prism. Actually they have problems with more than 2 diop of prism. Usually you have to block in the prism and not ask the generator to...
  10. Thread: Clip ons!

    by Lensman11
    Replies
    21
    Views
    1,570

    The downside of using Chemistre clips on a...

    The downside of using Chemistre clips on a drilled rimless is you might have to make the lens thicker to accommodate the magnets. This is sometimes objectionable to the patient. They usually warn...
  11. Replies
    2
    Views
    528

    Where in the Zeiss literature do they make this...

    Where in the Zeiss literature do they make this claim. Prism thinning has been added to progressive lenses for decades. The purpose of prism thinning is to equalize the thickness on the top and...
  12. Replies
    7
    Views
    665

    Check the off center optics in the ft. Move the...

    Check the off center optics in the ft. Move the lens horizontally and vertically in the lensometer and observe if there is any dramatic change in power do to poor surfacing techniques.
  13. Replies
    6
    Views
    862

    A reverse slab cannot be made at the lab level,...

    A reverse slab cannot be made at the lab level, it has to be part of the mold when the lens is cast. The market for this product is small and in high index it is smaller yet. The economics are not...
  14. Thread: Crizal Rock

    by Lensman11
    Replies
    65
    Views
    7,767

    Manufacturers are always going to produce new...

    Manufacturers are always going to produce new products sometimes better sometimes not. The marketing department will always spin it to get new customers. IMO the only thing the customer wants in an...
  15. Replies
    17
    Views
    1,422

    I guess I qualify as a lab rat with 5 decades...

    I guess I qualify as a lab rat with 5 decades owning and running different labs. I both agree and disagree with Chris’s statement. I was GM for one of the largest labs in the US doing 3000 orders per...
  16. Replies
    13
    Views
    1,077

    Measurements can be made by placing a piece of...

    Measurements can be made by placing a piece of tape across the back of the frame and measuring from a closed eye lid to the tape. Then you add approximately 3mm for the thickness of the lid and add...
  17. Alex most people don’t know that the word...

    Alex
    most people don’t know that the word optician is not a contraction of optical and technician but optical and magician. I was told that by a frame designer. Just kidding it really comes from...
  18. Alex If you are referring to flat metal frames...

    Alex
    If you are referring to flat metal frames False front meaning the eyewire is mounted behind the front I have simple solution. Most edgers allow you to alter shapes after you trace them just...
  19. Replies
    17
    Views
    1,422

    1.67 is a tintable material you should have no...

    1.67 is a tintable material you should have no issue getting what you want. If they are dip coating and thermal curing the process should be
    1. Tint the lenses a little darker than required as the...
  20. Replies
    17
    Views
    1,422

    Exactly what problem are they having because the...

    Exactly what problem are they having because the AR coating does not care if the the lens is tinted or not. I would guess one of two issues the tint is changing during the wash cycle before ar...
  21. Replies
    4
    Views
    764

    If the lens was truly crazed you cannot repair it...

    If the lens was truly crazed you cannot repair it in any way. By definition crazed means a layer of coating has cracked or separated from another layer. What you observed is a lens that was heat...
  22. Replies
    11
    Views
    1,304

    This is the same phenomenon that bifocal wearers...

    This is the same phenomenon that bifocal wearers complained about the biggest culprit was the Ultex style bifocal that was a 38 mm circle cut in half and the oc was at the bottom creating bd effect....
  23. Replies
    55
    Views
    13,427

    The straight line created by the desk does not...

    The straight line created by the desk does not cross the optical center in either lens (assuming the oc is in the center) yet the line is not displaced at all. How did the manage to accomplish that...
  24. Replies
    22
    Views
    2,277

    Don’t expect intervention from the FTC I was...

    Don’t expect intervention from the FTC I was questioned when Essilor was buying Armorlite the main question can you buy similar products from another source and of course you can then they are not a...
  25. Replies
    13
    Views
    1,411

    We used the Briot.. which ever you choose don’t...

    We used the Briot.. which ever you choose don’t buy it until you try it for at least a month.
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