Progressive spectacle lens
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United States of America Patent
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-
Jun 23, 1998
Issued Date -
N/A
app pub date -
May 16, 1997
filing date -
Aug 17, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A progressive spectacle lens is described which has a convex aspherical front surface 1 and a concave aspherical back surface 2, of which at least one surface contributes to the power increase from the distance portion 3 over the progression corridor 4 to the reading portion 5. The progressive spectacle lens in accordance with the present invention is characterized by the fact that the surface 1 or the surfaces contributing to the power increase are designed in such a way that the main portion of astigmatism is transposed into an area 3 in which the power practically does not increase and by the fact that the surface astigmatism of the two surfaces 1 and 2 substantially cancel each other out in these areas 3 or 6. (See FIG. 1).
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Family
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Cited Art Landscape
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