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  1. Replies
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    I believe it was Armorlite who was first to make...

    I believe it was Armorlite who was first to make plastic lenses.
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    Cr39 was originally made to line the fuel tanks...

    Cr39 was originally made to line the fuel tanks on ww2 bombers at the end of the war they started looking for other outlets for the material.
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    1,250

    Many decades ago when glass ruled you had to put...

    Many decades ago when glass ruled you had to put the lens in cutter before you edged it. The cutter used the pattern and cut the lens 2 mm larger than the finished size. After the lens came out of...
  4. Try tracing the demo lens instead of the frame

    Try tracing the demo lens instead of the frame
  5. Fitting and dispensing +18 requires a little more...

    Fitting and dispensing +18 requires a little more effort than just ordering the lens. Did the doc give a vertex distance if so did you match it or compensate for the difference. The patient will need...
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    DRK i am sure you never had poly that was...

    DRK
    i am sure you never had poly that was uncoated on the back they would become unusable within days of purchase if you did.
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    Correct but not just 1.67 poly or 1.56 or...

    Correct but not just 1.67 poly or 1.56 or anything except cr
  8. Replies
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    Any lens that gets a/r must be src on both sides...

    Any lens that gets a/r must be src on both sides or will you have coating failure very rapidly.. non a/r lenses of high index must have src. Cr is the only one where it is not essential. If the lab...
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    You can do the same calculations on Opticampus

    You can do the same calculations on Opticampus
  10. Replies
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    947

    Place it where it will not interfere with the...

    Place it where it will not interfere with the blocking of the lens
  11. Replies
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    It is called a salt pan because it was designed...

    It is called a salt pan because it was designed to use with salt. It works great and any residue is easily washed off.
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    The quality of the coating can absolutely be...

    The quality of the coating can absolutely be affected by the application. Errors can happen in any process but the lenses should not be sent out to the customer. In addition if is a licensed process...
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    Aligning the pins should be simple you will need...

    Aligning the pins should be simple you will need a fixture to do it. Not holding ink can usually be fixed by adding a few drops of dawn to the ink.
  14. Replies
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    You are referring to mechanical issues due to...

    You are referring to mechanical issues due to angle if the lens and yes you blocker will eliminate that i am referring to the prism displacing the image a causing the blocking problem.
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    It is most likely not slippage but the prism...

    It is most likely not slippage but the prism causes misalignment in the blocking. Get some Plano prisms and counter the prism in the blocking process
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    The reason you turn a segmented lens around to...

    The reason you turn a segmented lens around to check the power of the add is this eliminates the thickness of the lens which adds plus power to the seg. When you do this you must read the distance...
  17. Thread: Question 2

    by Lensman11
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    3,541

    Uncut if you keep the b constant and increase...

    Uncut
    if you keep the b constant and increase the a you will have a different shape with each size never saw a frame with those characteristics.
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    eEssilor did not go with the spherical front...

    eEssilor did not go with the spherical front route because Zeiss and Seiko had a patent on the process and they would have had to pay Royalties to do so.
  19. Replies
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    Never actually saw it just read about it in...

    Never actually saw it just read about it in Optical World magazine about 10 years ago if any one has a back issue it would help.
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    No polarizer will help with night vision that I...

    No polarizer will help with night vision that I know about in addition any tint added to the lens will only make things worse. What does help somewhat is a light that will reduce pupil size. There...
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    Exactly what kind of feedback have you received...

    Exactly what kind of feedback have you received from your customers. What criteria do you think is important for good results. My experience has been that patients only look for two features...
  22. Thread: Question 2

    by Lensman11
    Replies
    14
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    3,541

    Deepest point in the eye wire

    Deepest point in the eye wire
  23. Replies
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    The impact resistance is effected by the...

    The impact resistance is effected by the thickness of the coating too thick and you have a problem. If your lab does it right and checks every run you will never have a problem. We used to put a test...
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    Here is my spin on the issue. It does not happen...

    Here is my spin on the issue. It does not happen that often only when the total reading power is greater than the front base curve. It is does not seem to effect the wearability of the lenses as we...
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    Granger has them adjustable link belt

    Granger has them adjustable link belt
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