Spectacle lenses having an inside-out conicoidal front surface and method for forming same
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United States of America Patent
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Aug 10, 1993
Grant Date -
N/A
app pub date -
Nov 8, 1990
filing date -
Nov 8, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Plus and minus power ophthalmic spectacle lenses for the correction of distance vision incorporating a convex aspherical front surface are provided. The front surface of the invention is described mathematically as an inside-out conicoid. the inside-out conicoidal surface, when used in conjunction with a concave spherical or toroidal back surface, provides a lens having improved off-axis optical performance and reduced thickness and flatness characteristics relative to prior art lenses of the same back vertex power and refractive index.
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