Progressive spectacle lens producing only slight dynamic distortion
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United States of America Patent
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Oct 26, 2004
Issued Date -
N/A
app pub date -
Oct 25, 2002
filing date -
Apr 25, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
Described is a spectacle lens comprising a region (distance portion) designed for viewing at large distances and in particular 'to infinity'; a region (near portion) designed for viewing at short distances and in particular 'reading distances'; and a progressive zone disposed between the distance portion and the near portion, in which the power of the spectacle lens increases from a value at a distance reference point located in the distance portion to a value at a near reference point located in the near portion along a curve (principal line) veering towards the nose. The invention is rendered distinct by a feature, amongst others, according to which trajectories of motion fulfill specific conditions.
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Cited Art Landscape
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