Method of making progressive lens surface and resulting article
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United States of America Patent
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Jun 30, 1987
Grant Date -
N/A
app pub date -
Jul 22, 1983
filing date -
Jul 22, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The disclosure relates to progressive power or multifocal ophthalmic lens and methods and formers for making such lens. The optical power of such lens varies gradually from a near viewing zone to a distance viewing zone. Selected mathematical functions are progenitive of the lens and former shapes, and steps of the methods are characterized by various mathematical functions, and coordinate systems which are constrained to provided the desired transition of optical powers in an intermediate zone of the lens.
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