377 Prescription safety spectacles Focus types Varifocal Optima HD – the ultimate in customisation! • free-form varifocal lens taking into account idividual parameters such as cornea vertex distance, frame wrap angle and inclination • calculation of dioptres to an accuracy of one hundredth Varifocal OR • free-form varifocal lens with a blended near-vision area in the upper section to make overhead work easier • selection of the addition in the upper near-vision area (depending on the working distance) • the addition in the upper near-vision segment depends on the addition in the progressive part of the lens • the following can be selected: • type A: addition distribution: 100% bottom and 100% top • type B: addition distribution: 100% in the progressive near-vision area and 60% in the blended near-vision area • type B example: addition: bottom 2.0 dpt. /top 1.2 dpt. Bifocal lenses Bifocal • visibly ground segment for near vision ('reading field') • instant wearer acceptance as visible edge helps eyes to adjust • intermediate ranges are not corrected Bifocal Comfort • free-form bifocal lens with a rounded, blended near-vision area for a more aesthetic appearance • instant wearer acceptance due to soft transition to the near- vision area • handled in the same way as conventional bifocal lenses • intermediate ranges are not corrected Varifocal lenses • gradual transition from distance to near vision, known as the progression zone • the invisible progression zone also corrects intermediate distances • clear vision at all viewing distances • may require an initial adjustment phase
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