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Thread: Thickness vs. Off-Axis Distortion

  1. #1
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    Thickness vs. Off-Axis Distortion

    Hi everyone. I have a lens here that is a +3.50 / -3.50 @ 180 with a base curve of 6. My question is this: assuming the same rx, the same base curve, same lens material, etc., would decreasing the thickness of the lens decrease the off-axis distortion? I know that going to an aspheric lens or perhaps a higher base curve might help, but I am curious how much thickness alone affects this. This lens could be made at least 1.5mm thinner and still have ample edge thickness for the frame. Thanks for any insight.

  2. #2
    ATO Member HarryChiling's Avatar
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    Sure it will chaneg the back curve and the off axis power, but it would probably be negligable and in a case such as the one you described the lens will already have off axis power errors present unless the design is atoric.
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    Would an aspheric design in this case eliminate, or at least decrease significantly, the off axis distortion?

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