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Thread: Lens Data

  1. #1
    Bad address email on file QDO1's Avatar
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    Lens Data

    Is there a source of standardised PPL lens data, across the brands, that alows a side by side comparison of the physical aspects of the lens? It strikes me we all have our favourites, but dispensing choices are based on gut-feeling / brand loyalty or just good experience, as opposed to a scientific ananysis of the task infront of us

    the data I would like at my fingertips could include for example:

    • Progression width at 5, 10, 15, 20 mm below fitting cross
    • Progression power at 5, 10, 15, 20 mm below fitting cross
    • Measurement at which full reading power is achieved
    • Above 180 distortion patterns / power error %

    The problem as we all know, is that each manufacturers literature does naturally "slap some gloss" on thier particular lens design, leaving the optical professional with a pile of lens sheets all professing to be the best thing since...

    People may finish that sentance as they see fit

  2. #2
    Master OptiBoarder Jedi's Avatar
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    Try searching for Dr. Sheedy on this site, I believe there is a link to his study of progressives. It doesn't covering everything, but I find it a good resource.
    "It's not impossible. I used to bull's-eye womp rats in my T-16 back home."


  3. #3
    Master OptiBoarder rinselberg's Avatar
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    Quote Originally Posted by Jedi
    Try searching for Dr. Sheedy on this site, I believe there is a link to his study of progressives. It doesn't covering everything, but I find it a good resource.
    You can find links to two of Dr. Sheedy's publications on this web page:
    http://optometry.osu.edu/COOR/4059.cfm

    Thanks to OptiBoarder Robert Martellaro
    http://www.optiboard.com/forums/show...1&postcount=14

  4. #4
    Bad address email on file QDO1's Avatar
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    Wow.. now that is a facinating read. Dr Sheddy certainly has opened up a can of worms. Very useful information. ThanksDo any of you guys use Nikon in The US? what results do you get?

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