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Thread: Near Reference Point not correct.

  1. #1
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    Near Reference Point not correct.

    Help me please

    I wonder, Manufacturer said it is limit of technology...

    Order's 0.00/2.25 Polycarbonate PAL freeform

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ID:	12993 reference power from manufacturer at image(envelope)

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ID:	12994 DRP it's correct but NRP I have met SPH+2.40 CYL -0.43x84 I reject it because I feel it abnormal ,unwant astigmatism at NRP Is it normal or limit of technology?


    Regard

  2. #2
    Manuf. Lens Surface Treatments
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    So far I have never met anybody that could refract a -0.43 cyl at an axis of 84 degrees.
    Chris Ryser
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  3. #3
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    Are you sure you have it centered in the recticle right at the center of the umbilic of the lens's near area? Since the umbilic is cylindrical in design you can easily pick up toricity if not centered. Do you have a manual lensometer to compare readings with?

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    What type of Lenses are they? Could be related to compensation. Though it would be odd to have a compensated power that extreme

  5. #5
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    Quote Originally Posted by jc17777 View Post
    What type of Lenses are they? Could be related to compensation. Though it would be odd to have a compensated power that extreme
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    Type Lens is 1.59 Polycarbonate freeform Optotech design MD9 corridor 9

    Report NRP CYL was -0.16 but I triple recheck it.But at my hand NRP CYL it's -0.44 and I also recheck by manual lensometer others too. it almost CYL -0.50 D.

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