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Spectacle technique and technology
.. lens and what is the different in centration of aspherical.. .. far and near, how to center spherical spectacle lens and what is the different in centration of.. .. on measuring and centration of multifocal lenses, i.e. bifocal, trifocal, progressive and.. ..keywords: lens, progressive lens, spherical lens, aspherical lens,.. ..keywords: frame, spectacle lens, progressive lens, spherical lens, aspherical..