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Thread: Looking for a 1.67 index lap tool conversion chart

  1. #1
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    Looking for a 1.67 index lap tool conversion chart

    Hi All,

    I am looking for a 1.67 index lap tool conversion chart from either 1.50 or 1.53 index? Any help would be appreciated.

    Thanks

  2. #2
    ATO Member HarryChiling's Avatar
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    Quote Originally Posted by kmcross View Post
    Hi All,

    I am looking for a 1.67 index lap tool conversion chart from either 1.50 or 1.53 index? Any help would be appreciated.

    Thanks
    Multiply your base and cross by the ratio 0.67/0.53 or 0.67/0.50, make your own chart using an excel sheet with these formulas pluged into it, you can round to the nearest 1/4, 1/8, or 1/10th diopter in excel using

    =Round($cell*400, -2)/400
    =Round($cell*800, -2)/800
    =Round($cell*1000, -2)/1000
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  3. #3
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    Excel sheet in german, but easy to translate.
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