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Thread: Need a little help on

  1. 11-30-2009, 01:42 PM #1
    Zildjian242
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    Need a little help on

    Hello all pretty cool sight, im currently in school for ophthalmic dispensing. I need a some help on determining the thickest point and the thinnest point on a lens when just giving a prescription. My notes on this is a mess
    So how would i go about doing this say whats thickest point on a lens with a -2.50-1.25x90 percription?
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  2. 11-30-2009, 03:37 PM #2
    Jacqui
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    it would be on the 180 line, thickness is dependent on lens size.
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  3. 11-30-2009, 04:01 PM #3
    Fezz
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    The Power Cross is your friend!

    It is also known as the Optical cross.

    Here is astart!

    http://www.opticianworks.com/chapter2.html
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  4. 11-30-2009, 04:17 PM #4
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    http://www.nfos.org/degree/opt11/module_08b.html
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  5. 11-30-2009, 04:19 PM #5
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    http://www.laramyk.com/education/opt...lens-form.html
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  6. 11-30-2009, 04:23 PM #6
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    http://www.eyetec.net/group4/M16S2.htm
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  7. 11-30-2009, 04:42 PM #7
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    I suggest a little - One-on-One with the instructor to clear this up.
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  8. 12-01-2009, 03:32 AM #8
    hasyasasa
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    The Power Cross is your friend!

    It is also known as the Optical cross.
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