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Thread: Brevis vs Brevity

  1. #1
    OptiBoard Apprentice
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    Brevis vs Brevity

    Hello
    I work i Norway, and here we have Zeiss Brevis. I have read some articles where Brevity is been tested. I assumed that this was the same lens as Brevis. But when I look at the centration chart there is a difference:

    1. The engravings are circles i Brevity, but the Zeiss square marks i Brevis
    2. The Prism refrence point is 2 mm below i Brevity, but the standard 6 mm i Brevis.
    3. Brevis has B50 for identification (Brevis index 1.50) - For Brevity I dont know....
    4. Brevity min. fittingheight 16 mm, Brevis 17 mm. Corridor length for Brevis is 13 mm

    Can someone (Darryl Meister?) please tell me the differences between these two lenses. Until today I have assumed that these are equal, and been using the information about Brevity from different articles when dispensing Brevis.....
    Patience brings power

  2. #2
    OptiBoard Professional
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    sigh. so much wrong here

  3. #3
    Master OptiBoarder
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    Sadly Darryl passed away last year. And unfortunately i haven't come across a brevity lens before.

  4. #4
    One eye sees, the other feels OptiBoard Silver Supporter
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    They should be the same- different names for different markets I think. The Zeiss Brevity is a medium corridor length, general purpose PAL, with a 3mm drop. Fairly low levels of unwanted astigmatism for a 10+ year old design (about 1.75 DC for a +2.00 add power).
    Science is a way of trying not to fool yourself. - Richard P. Feynman

    Experience is the hardest teacher. She gives the test before the lesson.



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