Blocking shim and method for prescription-laboratory processing of aspheric progressive-addition lenses
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United States of America Patent
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Jul 24, 1990
Grant Date -
N/A
app pub date -
Jun 9, 1988
filing date -
Jun 9, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A thin sheet of flexible material shaped like an inverted 'T', is applied to the aspheric distance portion of a progressive-addition ophthalmic lens, to provide stable three-point contact for blocking the lens prior to second-side surfacing in the prescription laboratory.
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