System varioPLUSEschenbach's system varioPLUS is ideal for reading over long periods of time and for users who have difficulty holding the magnifier freely, they feature: Aspheric PXM lightweight lens, cera tec coated for a distortion free image with edge to edge sharpness Details on magnification recommended eye lens distance are stated on all magnifier heads Magnifiers heads 15539 , 15549 and 15599 come with a retractable red reading line for easy line orientation
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