Progressive spectacle lens having only a small change of binocular properties during a movement of glance
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United States of America Patent
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Aug 17, 2004
Grant Date -
Jul 31, 2003
app pub date -
Oct 28, 2002
filing date -
Apr 27, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
A spectacle lens comprises 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 a 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 a nose. The invention is distinct in that, for minimizing a change of binocular imaging properties with horizontal movements of glance, a lift (difference between a maximum and a minimum value occurring during a movement) of binocular imaging properties when a moving object is being followed, is smaller than a physiologically pre-determined limiting amount.
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