Color Vision Correction Filter with Bulk Absorption
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Solution Overview
Problem
Conventional color vision correction spectacle lenses have high surface reflectance, which affects their effectiveness in assisting individuals with color vision deficiency.
Innovation Solution
A color vision correction filter with specific dye materials, such as merocyanine, tetraazaporphyrin, or phthalocyanine, dispersed in a transparent resin base material, reducing surface reflectance by inhibiting the transmission of specific wavelengths, particularly green light, to correct color vision deficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a partial reflection coating is used on the lens surface to correct color vision deficiency, then the color discrimination ability is improved, but the surface reflectance becomes high
Solution Approach 1:
The patent changes the fundamental parameter of color correction from surface-based reflection to bulk-based absorption. By controlling the transmittance characteristics of the lens material itself (setting T440/T600 between 0.1-0.5 and positioning the lowest transmittance at 520-540nm), the invention achieves color vision correction without relying on reflective coatings, thereby reducing surface reflectance while maintaining color discrimination capability.
Solution Approach 2:
The patent uses composite lens materials with specific transmittance characteristics embedded in the bulk material. By incorporating materials that selectively absorb certain wavelengths (particularly green light around 535nm) while transmitting others, the invention creates a composite structure that provides both color correction and reduced surface reflection properties simultaneously.
2Measurement precision
If a partial reflection coating is applied to correct color vision, then color perception is enhanced, but light transmission is reduced
Solution Approach 1:
The patent optimizes the transmittance parameters by setting the ratio T440/T600 between 0.1 and 0.5, and positioning the wavelength of lowest transmittance at 520-540nm with a full width at half maximum of 80-120nm. This parameter control allows selective absorption of problematic wavelengths while maintaining adequate light transmission for visual acuity, resolving the contradiction between color perception enhancement and light transmission loss.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The filter achieves a lower surface reflectance and effectively corrects color vision deficiency by maintaining a perceptual balance between red and green light, improving usability and comfort for individuals with color vision deficiency.
Implementation Method 1
A color vision correction filter according to one aspect of the present disclosure includes at least one type of dye material. The lowest value of transmittance of the color vision correction filter in a wavelength band ranging from 440 nm to 600 nm, inclusive, is in a range of plus or minus 50 nm of 535 nm.
Data Source
AI summary
A color vision correction filter includes a least one type of dye material and the lowest value of transmittance of the color vision correction filter in a wavelength band ranging from 440 nm to 600 nm, inclusive, is in the range of plus or minus 50 nm of 535 nm.