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standard optical position centre |
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centre, standard optical position A reference point specific to each spectacle lens shape. The standard optical position is on the vertical line passing through the boxed centre, and is at the boxed centre. See boxing centre; boxing system. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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