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  1. This is a very difficult problem for a lab that...

    This is a very difficult problem for a lab that receives hundreds of different frames to know all the issues each frame will encounter. If a lab is lucky enough to supply all the frames they have to...
  2. Your request was posted directly above your last...

    Your request was posted directly above your last post
  3. Not to be repetitive the cylinder is the value of...

    Not to be repetitive the cylinder is the value of the difference of the two Primary powers if you want to say it has power that is fine. If it has a power than it has to have a value plus or minus....
  4. The cylinder represents the difference in power...

    The cylinder represents the difference in power between the two principal meridians. When neutralizing the lens in a vertometer you will not find a reading of -5.00 only 0.00 and +5.00 the powers in...
  5. Kwill212 please give a more detailed explanation...

    Kwill212
    please give a more detailed explanation of your solution. The cylinder on a lens has no power it only represents the difference between the principal meridians in this case +5.00 and 0.00
  6. I would guess you are calculating the power at...

    I would guess you are calculating the power at 180 and then using Prentices rule for prism. That does not yield the correct answer except if the axis is 180 or 90.Opti campus answer is the correct...
  7. Replies
    12
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    702

    Hi i am currently retired so can’t give you a...

    Hi
    i am currently retired so can’t give you a specific lab. The product is listed in XCel catalog as semi finished product so try calling them. Secondly contact any lab that does glass themself they...
  8. Replies
    12
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    702

    Still available from XCel in two sizes 9 22 9 25

    Still available from XCel in two sizes 9 22 9 25
  9. There is no definitive answer to the question...

    There is no definitive answer to the question when to change the cutter. How many poly do you do, how thick is every lens as drilling a -6.00 wears the bit way more than -0.50. No one collects that...
  10. If the process is done correctly there is no need...

    If the process is done correctly there is no need to do anything to the holes or the edge. Change the cutting bit when it is due. Yes it cost money to replace the cutter but the damage done by not...
  11. Obtain some UV cure hard coat from your lab. You...

    Obtain some UV cure hard coat from your lab. You will need to purchase a uv light to cure the coating but it will shine the edges and seal the holes. Application will be with a paint brush any...
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    526

    Calculating the thickness can get quite...

    Calculating the thickness can get quite complicated especially with progressive lenses. To keep it simple and have a reasonable result you need the axis of the ED then determine the curves at that...
  13. Thread: Abo help

    by Lensman11
    Replies
    21
    Views
    1,617

    When Prentice came up with his infamous rule...

    When Prentice came up with his infamous rule Toric lens were rare expensive and hardly used. I don’t think he even considered the effect of a lens with two powers.
  14. Thread: Abo help

    by Lensman11
    Replies
    21
    Views
    1,617

    Prentices rule is being used incorrectly. It...

    Prentices rule is being used incorrectly. It will only provide a correct answer with a spherical power or where the axis is 90 or 180. As an extreme case to show why it does not work. Rx +2.00 -400...
  15. I think you over thinking this issue. When you...

    I think you over thinking this issue. When you fit a s.v. Lens you put the oc in the geometric center but normal gaze is usually above geometric center. This is rarely a problem. The same holds true...
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    1,154

    The progressive with an ultex seg on the top was...

    The progressive with an ultex seg on the top was originally. Called the pilot as it was intended to allow the pilot to see the gauges above his head The add on the top was 3/4 of the bottom add....
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    813

    Check if the lens is warped. Use a lens clock and...

    Check if the lens is warped. Use a lens clock and check at 90 and 180. The true base curve will be at 90, compare that with the other glasses the patient is wearing.
  18. Replies
    6
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    813

    It is possible that one or both of the lenses are...

    It is possible that one or both of the lenses are off polarization. It is common error at the lab being they are spheres the mark up person could easily forget to watch the polarization axis. You...
  19. Thread: Slab-Off Pal

    by Lensman11
    Replies
    7
    Views
    965

    It can be done on any digital progressive, the...

    It can be done on any digital progressive, the lab just has to put the slab on the front. Younger makes cast slab blanks which could also be used. ( I am not sure they still make the product)
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    1,669

    The skills that defined an optician have all been...

    The skills that defined an optician have all been automated. The customer interaction has always been extremely poor. The ability (with a few exceptions) to direct a customer to proper lens selection...
  21. I have many years experience with all three...

    I have many years experience with all three manufacturers and would say they all fall short in some areas. Operating a free form lab is not a simple task. Plan on having a trained tech on site and...
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    18
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    1,418

    This is my experience managing a lab doing 1800...

    This is my experience managing a lab doing 1800 orders a day. We supplied 85% of the frames for our orders and did not trace anything except the first time we processed the frame. This is what I...
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    3,777

    They indeed react to visible light but not the...

    They indeed react to visible light but not the the full spectrum. They do not activate to their full potential in a car because the uv is blocked. If they reacted to the full spectrum they would not...
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    21
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    3,777

    Remember Transitions is activated by UV not...

    Remember Transitions is activated by UV not visible light. Most materials block uv except cr and many AR coating are formulated to do the same. So the goal is to not block uv.
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    2
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    455

    Hi if your input numbers are being taken with a...

    Hi
    if your input numbers are being taken with a mm scale you will be wrong as often as you are correct. To get the E.D. Of a frame you must box the shape or get from the frame specs or get from your...
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