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Spectacle technique and technology
.. distance for far and near, how to center spherical spectacle lens and what is the different in.. .. 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: frame, spectacle lens, progressive lens, spherical lens, aspherical lens,.. ..keywords: frame, spectacle lens, progressive lens, spherical lens, aspherical..