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Thread: OCs on Gradient Polarized lenses

  1. #1
    Ghost in the OptiMachine OptiBoard Silver Supporter Quince's Avatar
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    OCs on Gradient Polarized lenses

    So my office is looking for some insight/ advice on processing polarized gradients.

    The scenario is this:

    We want to raise the height of the gradient on the finished product so that the variation is more prominent. Doing that at edging moves the optical center too high, therefore it needs to be done during surfacing.

    I use Visual Lab and rely on the preset adjustments to the OC for multifocals but am not versed on how to properly manipulate for cosmetic reasons. A assume that if I enter a -5 in the OC box (within VL) that will set the OC 5 under the center of the lens and therefore raise the gradient for edging, but I figured I might get a second opinion or two before using up my stock.

    Thanks in advance!
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    I eagerly await answers to this thread!

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    Master OptiBoarder optical24/7's Avatar
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    My 1st thought is you can certainly drop the OC 5mm’s on your blank like you describe, but you will effectively loose 10 mm of blank size for cut out. Could be a concern on large ED frames, primarily on the lower temporal area of the frame shape.

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    Master OptiBoarder OptiBoard Silver Supporter lensmanmd's Avatar
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    You may need a two step process on this. Surface the lenses with the OC at the demarcation, then recalc it for finish layout with the desired placement.
    Not sure why you want to do this, though. Grads look best with the demarcation centered in the frame. I agree with optical24/7, you will lose effective blank size on larger frames.

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    Ghost in the OptiMachine OptiBoard Silver Supporter Quince's Avatar
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    Good point- this method is limited to minimum blank size requirements, but in theory no other problems come to mind?
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    Ghost in the OptiMachine OptiBoard Silver Supporter Quince's Avatar
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    Quote Originally Posted by lensmanmd View Post
    You may need a two step process on this. Surface the lenses with the OC at the demarcation, then recalc it for finish layout with the desired placement.
    Not sure why you want to do this, though. Grads look best with the demarcation centered in the frame. I agree with optical24/7, you will lose effective blank size on larger frames.
    I'm not sure I follow. Are you suggesting to run it through the generator twice?

    Or do you mean process as normal then set the OC high during finish?
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    Master OptiBoarder OptiBoard Silver Supporter lensmanmd's Avatar
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    No. Surface once. Depending on the lab, finish layout will use the oc values, especially with automation. Recalcing the order after surface will insure that the layout values match the desired outcome.

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    Ghost in the OptiMachine OptiBoard Silver Supporter Quince's Avatar
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    I'm in a complete lab, which is great for communication in situations like this (I love that I get to see my surfaced work as a finished product!) but I was under the impression that raising the OC at finish could be problematic for the wearer?

    I obviously don't edge...
    Have I told you today how much I hate poly?

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    Ghost in the OptiMachine OptiBoard Silver Supporter Quince's Avatar
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    Quote Originally Posted by lensmanmd View Post
    Not sure why you want to do this, though. Grads look best with the demarcation centered in the frame.
    We are using the Younger version, which I'm finding is very inconsistent. Depending on base curve, the color seems to vary as well as the strength of the gradient.
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    Ghost in the OptiMachine OptiBoard Silver Supporter Quince's Avatar
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    After talking with my tech, we've decided for now this will be a per job variable. Our processing with go by RX strength and frame choice. Thanks for the input guys!
    Have I told you today how much I hate poly?

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    I had one just the other day, very little power at 90 , so I could move the gradient up or down as much as I wanted. It jsut depends on the vertical lens power

  12. #12
    Master OptiBoarder OptiBoard Silver Supporter lensmanmd's Avatar
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    No worries. Interesting thread. I met with IOT last year @VEE. They brought the conundrum with grad lenses to my attention at that time. They were very interested in grad variations based on OCs, more from a R2L consistency, and fed these variables into our program. OC heights were not a consideration, however. They wanted to make sure that the SDF file took the gradation into consideration, so that they were centered and uniform.

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    Ghost in the OptiMachine OptiBoard Silver Supporter Quince's Avatar
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    Quote Originally Posted by CME4SPECS View Post
    I had one just the other day, very little power at 90 , so I could move the gradient up or down as much as I wanted. It jsut depends on the vertical lens power
    That's definitely going to be a factor to consider. I had the finishing tech explain that low power (especially cyl) gives more wiggle room. Good to know others are having success with this method.
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    Master OptiBoarder OptiBoard Silver Supporter Barry Santini's Avatar
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    The gradient line shoukd be treated as a seg line

    B

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    Master OptiBoarder OptiBoard Silver Supporter lensmanmd's Avatar
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    Quote Originally Posted by Barry Santini View Post
    The gradient line shoukd be treated as a seg line

    B
    Barry, we seem to disagree on this. Please enlighten me as to why you believe this to be the best method?

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    If it is a rx lens can you order the lens with OC decentration??

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    Quote Originally Posted by dima View Post
    If it is a rx lens can you order the lens with OC decentration??
    If it is a gradient polarized lens you definitely need know someone at your lab who can "special" it, at least if you regularly deal with the RXs that I do. I hope that makes sense to you. No hablo italiano! :)

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    Double post

  19. #19
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    It makes sense :) thank you.

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