Polarized optical elements enhancing color contrast and methods for their manufacture
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United States of America Patent
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Issued Date -
Feb 16, 2006
app pub date -
Mar 25, 2005
filing date -
Mar 25, 2004
priority date (Note) -
Abandoned
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Abstract
A polarized optical element comprising a polarized optical part is dyed so that the optical part exhibits a curve of spectral transmittance in a wavelength range comprised between 400 and 700 nm comprising: i) at least one relative maximum at a wavelength comprised between 400 and 510 nm, and ii) at least one relative minimum at a wavelength comprised between 510 to 625 nm, wherein the ratio between the value of the factor of spectral transmittance at said at least one relative maximum and the value of the factor of spectral transmittance at said at least one relative minimum is of at least 1.3, and wherein the ratio between the value of the factor of spectral transmittance at a wavelength of 700 nm and the value of the factor of spectral transmittance at said at least one relative minimum is of at least 3.0. Advantageously, such a polarized optical element is both polarized to reduce glare and provides the wearer with enhanced visual acuity, especially an increased sensitivity to the red and blue colors so as to meet the color and traffic signal recognition requirements of the international standards.
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