Photochromically colored object
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United States of America Patent
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Aug 15, 2000
Grant Date -
N/A
app pub date -
Dec 30, 1997
filing date -
Jul 10, 1994
priority date (Note) -
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Abstract
Disclosed is an object made of plastic material, in particular a plastic ophthalmic lens, colored with at least one photochromic substance which is also excited by light in the UV range of the spectrum and has a higher absorption in the excited state, judged by the spectral light sensitivity of the human eye, than in the not excited state and to which, in addition, at least one UV absorbing material is added in such a concentration that darkening of the photochromic substance(s) is independent of the UV fraction of the excitation light. But rather the intensity of the darkening depends on brightness, i.e. the intensity integrated over the spectral light sensitivity of the human eye V.sub.2.
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