Progressive ophthalmic lens with positive distance power
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United States of America Patent
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May 11, 1993
Grant Date -
N/A
app pub date -
Mar 18, 1991
filing date -
Jul 17, 1989
priority date (Note) -
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status (Latency Note)
Importance
Abstract
Disclosed is a progressive ophthamic lens having positive distance portion power, in which at least one surface is designed as a progressive area, and a distance portion (FT) intended for distant vision having practically constant distance portion power and a near portion (NT) intended for hear vision having practically constant near portion power including a progression zone (PZ), in which the surface refractive power increases from the surface refractive power (D.sub.F) present at the distant reference point (B.sub.F) along a curved of plane main meridian (HM) to the surface refractive power (D.sub.N) present at a near reference point (B.sub.N).
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