Progressive power presbyopia-correcting ophthalmic lenses
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United States of America Patent
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Jul 7, 1998
Grant Date -
N/A
app pub date -
Aug 22, 1995
filing date -
Aug 26, 1994
priority date (Note) -
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Abstract
An ophthalmic lens includes a refractive surface partitioned into a first area, a second area located above the first area and a third area located below the first area. The first area includes a reading point providing a first refractive focal power on a meridional line. The second area provides a surface refractive focal power less than that of the reading point, and the third area provides a surface refractive focal power stronger than that of the reading point. The refractive focal power in the first area progressively changes between the second and third areas. The first area includes a quasi-clear vision area that has a maximum horizontal width in the proximity of the geometrical center of the lens and a clear vision area.
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