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  1. Replies
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    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...
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    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.
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    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...
  4. Thread: Crizal Rock

    by Lensman11
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    4,005

    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...
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    988

    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...
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    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...
  7. 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...
  8. 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...
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    988

    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...
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    988

    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...
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    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...
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    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....
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    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...
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    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...
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    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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    My experience is that the scanner works correctly...

    My experience is that the scanner works correctly every time. The only thing required of the operator is to make sure the lenses that were in the frame fit correctly and to spot the 180line. It also...
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    My experience with remote tracing is exactly what...

    My experience with remote tracing is exactly what Lensmanmd stated. If it was a frame we sold in the past no problem we had the data stored If it was a standard bevel or groove we would use a scanner...
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    Impossible orders

    Working at the lab side of the business most of my career I have had many a chuckle over some of things retailers have done or asked us to do. I thought it might be fun to post some of the funny I...
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    MBS might seem like magic but is important to...

    MBS might seem like magic but is important to know how things work.
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    754

    Barry is correct another way to express this is...

    Barry is correct another way to express this is if the longest radius is nasal than the built in decentration is equal to how much longer the nasal radius is than the temporal. The same issue is...
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    Another common misconception created by the...

    Another common misconception created by the boxing system is if you double the decentration and add it to the ED you will have the minimum blank size for that frame. Anyone care to explain this...
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    Great job it was Tom Lynch at Winchester optical...

    Great job it was Tom Lynch at Winchester optical they are still in business today as an Essilor lab. His concept was not well received and to this day many people in the industry cannot measure the...
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    Boxing system

    This is just a trip down memory lane. What was used for frame measurements before the boxing system What year did the boxing system go into use and who invented it.
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    754

    Boxing system

    This is just a trip down memory lane. What was used for frame measurements before the boxing system What year did the boxing system go into use and who invented it.
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    Now that I jumped down the rabbit hole. You are...

    Now that I jumped down the rabbit hole. You are creating two base in prism by moving the seg 5 mm but depending on the distance Rx it would be a combination of the prism created by the power and...
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