Optical element for use in eye protection devices and methods for its manufacture
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United States of America Patent
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Issued Date -
Jun 1, 2006
app pub date -
Mar 25, 2005
filing date -
Mar 25, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An optical element is described comprising an optical part dyed so as to have a curve of the factor 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 and 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 an optical element allows to enhance visual acuity, increasing in particular the chromatic contrast and the sensitivity to the red and blue colors, and to meet the traffic lights and road signal recognition requirements indicated by the international standards.
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