Apparatus for producing ultraviolet blocking lenses
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United States of America Patent
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-
Jan 16, 2001
Grant Date -
N/A
app pub date -
Sep 14, 1999
filing date -
Jul 31, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An eyeglass lens forming composition containing light absorbing compounds which may undergo light initiated polymerization is provided. Typically, lens forming compositions that absorb light do not permit enough activating radiation to penetrate into the depths of the lens cavity to adequately initiate polymerization of the lens forming composition. An embodiment of the invention provides a system and method for curing such a lens forming composition to form a lens that does not transmit ultraviolet light. Activating light is used having a wavelength greater than the wavelengths of light which the light absorbing compounds absorb. The power of the formed lenses may be controlled by varying the lens forming conditions. Additionally, the lens forming process may be controlled using a microprocessor based control system.
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