Spectacle Lens Blue Light Filter Coating
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Solution Overview
Problem
Existing spectacle lenses with blue light filters often cause spectral color shifts and are not long-term stable, especially when using organic dyes or pigments that can degrade under harsh conditions, leading to ineffective melatonin regulation and sleep disturbances.
Innovation Solution
A spectacle lens with a single antireflection coating made of mineral or organic material, featuring a filter effect for blue light in the 430 nm to 530 nm range, achieved through interference and reflection, without using dyes or pigments, ensuring high transmission in visible light and reduced blue light emission, particularly around 464 nm to counteract melatonin inhibition without altering the perceived color spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organic dyes or pigments are used in a filter layer for blue light, then the filter effect for blue light is achieved, but the structure becomes complicated and long-term stability deteriorates under harsh ambient conditions
Solution Approach 1:
The patent extracts the blue light filtering function from a separate filter layer with organic dyes/pigments and integrates it into a single antireflection coating layer. This eliminates the need for complex multi-layer structures while maintaining the filter effect, thereby improving long-term stability without compromising filtering performance.
Solution Approach 2:
The patent combines the antireflection function and the blue light filtering function into a single integrated coating layer. This merging of functions simplifies the overall structure, reduces the number of layers needed, and improves long-term stability by eliminating interfaces between separate filter and antireflection layers.
2Reliability
If a filter layer with dyes or pigments is used to reduce blue light, then blue light filtering is achieved, but uniform incorporation becomes difficult and processing outlay increases
Solution Approach 1:
The patent combines the blue light filtering function with the antireflection coating into a single layer, eliminating the need for separate filter layer application processes. This integration simplifies manufacturing by reducing the number of coating steps and ensures uniform incorporation of filtering properties throughout the entire coating thickness.
Solution Approach 2:
The patent changes the material composition parameters of the antireflection coating to include blue light filtering capabilities. By adjusting the refractive index and composition of the single coating layer, the patent achieves both antireflection and blue light filtering functions without requiring complex multi-material layering.
3Reliability
If blue light is reduced using traditional filters, then melatonin synthesis is protected, but spectral color shifts occur causing yellow or orange tinge
Solution Approach 1:
The patent carefully controls the optical parameters of the single coating layer, specifically the refractive index and thickness, to achieve selective blue light filtering while maintaining high transmission in the yellow-green region (560-580 nm). This parameter optimization prevents yellow or orange tinging by ensuring sufficient transmission of wavelengths that contribute to natural color perception.
Solution Approach 2:
The patent applies local quality by creating wavelength-selective optical properties within the single coating layer. The coating is designed to have different optical characteristics at different wavelengths: high reflection/low transmission in the blue region (430-530 nm) and high transmission in the yellow-green region, thereby achieving localized spectral filtering without overall color distortion.
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 solution effectively reduces blue light exposure, promoting healthy sleep by inhibiting melatonin suppression without causing noticeable color shifts or spectral changes, and maintains long-term stability and simplicity in production.
Implementation Method 1
the at least one first antireflection coating having a filter effect for blue light in a wavelength range from 430 nm to 530 nm
Implementation Method 2
achieved through interference and reflection
Data Source
AI summary
A spectacle lens for an eye of a wearer of spectacles has a front surface and a back surface, wherein the front surface of the spectacle lens faces away from the eye and the back surface of the spectacle lens faces the eye. The spectacle lens includes an optical lens substrate made of or containing mineral glass and/or organic glass, wherein the spectacle lens has at least one first antireflection coating and at least one second antireflection coating, wherein the at least one first antireflection coating has a filter effect for blue light. Further, spectacles containing the spectacle lens are also disclosed.