Selective Interferential Ophthalmic Filter for Retinal Protection
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Solution Overview
Problem
Current ophthalmic devices lack effective control over spectral response to non-collimated light, leading to distortion of color perception and impact on non-visual functions, and fail to adequately protect against specific harmful wavelengths associated with retinal diseases such as AMD, glaucoma, and other pathologies.
Innovation Solution
A multifocal ophthalmic lens with selective interferential filtering means that inhibit specific spectral bands of light, designed to minimize angular sensitivity by considering a range of incidence angles, using technologies like thin film devices, rugate filters, photonic bandgap materials, and holographic devices to provide quasi-independent spectral response across the optical substrate, thereby reducing distortion and protecting against harmful wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If selective interferential filtering means are used to block specific harmful wavelengths, then protection against retinal diseases is improved, but distortion of color perception and impact on non-visual functions worsen
Solution Approach 1:
The patent applies parameter changes by precisely controlling the spectral transmission characteristics of the optical device. Instead of using broad-spectrum filters that block large portions of the visible spectrum, the invention uses selective interferential filtering to block only specific harmful wavelength bands (such as 400-450nm and 480-530nm) while maintaining high transmission in other regions. This selective parameter control allows blocking harmful wavelengths without causing significant color perception distortion, as the transmitted light spectrum remains relatively balanced across the visible range.
Solution Approach 2:
The patent employs composite filtering structures combining multiple interferential filter layers with different spectral characteristics. These composite structures enable simultaneous blocking of multiple harmful wavelength bands while maintaining overall spectral balance. The combination of different filter materials and designs allows achieving superior selectivity, where specific narrow wavelength ranges are blocked with high precision without affecting the transmission of adjacent wavelengths, thus minimizing color distortion while maximizing protection.
2Object-affected harmful factors
If broad spectrum filtering is used to protect against harmful radiation, then protection against retinal damage is improved, but impact on non-visual functions and color perception worsens
Solution Approach 1:
The patent applies parameter changes by precisely controlling the spectral transmission characteristics of the optical device. Instead of using broad-spectrum filters that block large portions of the visible spectrum, the invention uses selective interferential filtering to block only specific harmful wavelength bands (such as 400-450nm and 480-530nm) while maintaining high transmission in other regions. This selective parameter control allows blocking harmful wavelengths without causing significant color perception distortion, as the transmitted light spectrum remains relatively balanced across the visible range.
Solution Approach 2:
The patent applies local quality by targeting specific wavelength regions for filtering rather than applying uniform broad-spectrum filtering. The interferential filters are designed to provide localized spectral modification at specific harmful wavelength bands while leaving the rest of the spectrum largely unaffected. This localized filtering approach ensures that non-visual functions regulated by specific wavelength ranges (such as circadian rhythm regulation by blue light) are preserved while only the most harmful localized wavelength bands are blocked.
3Ease of manufacture
If conventional filters are used, then manufacturing simplicity is maintained, but angular sensitivity causes loss of spectral control
Solution Approach 1:
The patent applies segmentation by dividing the filtering function into multiple discrete interferential filter layers, each designed to target specific wavelength bands and angle ranges. Instead of using a single broad-spectrum filter, the invention segments the spectral control into multiple narrow-band filters with specific angular characteristics. This segmentation allows each layer to be optimized for particular spectral regions, improving overall spectral control precision while maintaining manufacturing feasibility through standardized filter layer deposition processes.
Solution Approach 2:
The patent employs composite filtering structures combining multiple interferential filter layers with different spectral characteristics. These composite structures enable simultaneous blocking of multiple harmful wavelength bands while maintaining overall spectral balance. The combination of different filter materials and designs allows achieving superior selectivity, where specific narrow wavelength ranges are blocked with high precision without affecting the transmission of adjacent wavelengths, thus minimizing color distortion while maximizing protection.
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 minimizes distortion of color perception, limits the impact on non-visual functions, and provides enhanced protection against specific retinal diseases by selectively filtering out harmful wavelengths, slowing down disease progression and preventing phototoxicity.
Implementation Method 1
selective interferential filtering means providing selective inhibition of the transmission of incident light
Implementation Method 2
configured to inhibit transmission of incident light by at least one of reflection, refraction and diffraction
Implementation Method 3
configured to inhibit transmission of incident light by at least one of reflection, refraction and diffraction
Implementation Method 4
configured to inhibit transmission of incident light by at least one of reflection, refraction and diffraction
Implementation Method 5
Angular sensitivity of interferential filters is first taken into account by considering a determined range of angles of incidences, referred to as the cone of incidence angles, to design the filters
Implementation Method 6
This last cell type is important for circadian photoentrainment (biological rhythms) and pupillary function
Implementation Method 7
The vertebrate retina is a light-sensitive tissue lining the inner surface of the eye
Data Source
Figure 1A
Figure 1B~1F
Figure 1C~1D
AI summary
An optical device comprising an optical substrate comprising a first surface having a first zone provided with first selective interferential filtering means for selectively inhibiting transmission of incident light based on the wavelength spectrum of the incident light, the first selective interferential filtering being configured to inhibit, at a first rate of rejection, transmission of a first selected range of wavelengths of incident light, incident on the first zone within a first selected range of angles of incidence.