Filter for a special purpose lens and method of making filter
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United States of America Patent
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Oct 17, 2000
Grant Date -
N/A
app pub date -
Nov 20, 1998
filing date -
Nov 20, 1998
priority date (Note) -
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Abstract
A filter and method for making a filter for enhancing a person's ability to differentiate between different shades of a spectral color of interest involves obtaining spectral data for the different shades and plotting the data on a chromaticity diagram. The standard deviation of the data is determined and a merit function based on the standard deviation is developed. Filters having positive merit functions are deemed appropriate candidates for the special purpose lens.
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