How do Varilux lenses give more natural head posture?
Progressive addition lenses (PAL’s) are often said to correct presbyopia while ensuring natural vision. Varilux PALs provide more natural vision than do bifocals and competitive progressive addition lenses.
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A Non-Presbyope If we compare the reading habits of a non-presbyope (either someone who wears no glasses or a single vision lens wearer) to those of a wearer of non-Varilux progressive lens, we see that they are obviously different. When a non-presbyope reads a document, the head is lowered significantly (average 45º), and the eyes move downward about 15º. |
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With Non-Varilux Progressive lenses A wearer of a non-Varilux progressive lens must lower the eyes significantly more (about 30º) to reach the near-vision or reading zone located low in the lens. Consequently, the head must be raised more than in the natural situation (lowering of about 30º instead of 45º). |
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With Varilux With Varilux lenses, due to the higher location of the near-vision zone, the wearer lowers his eyes less than with a non-Varilux progressive (about 25º compared with 30º) and thus enjoys more natural head posture. |
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