Spectral Glare Control Eyewear Narrow-Band Filter
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Solution Overview
Problem
Conventional blue-light attenuating filters for glare reduction often compromise color vision quality, particularly for blue colors, due to broad wavelength filtering, leading to undesirable side effects like desaturated skies and confusing color appearances, which reduces user satisfaction and adherence to wearing the eyewear.
Innovation Solution
The development of improved high-transmission blue-attenuating filters that selectively filter a narrow band of light between 460 nanometers to 500 nanometers, using narrow-band dyes to achieve equivalent glare reduction while preserving color vision quality, characterized by a spectral notch filter with a peak optical density of at least 2 and a visible luminous transmittance of 60% to 85%, ensuring better color perception and reduced discomfort from glare.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If broad wavelength filtering is used to reduce glare, then glare reduction is improved, but color vision quality deteriorates
Solution Approach 1:
The patent segments the blue light spectrum into multiple narrow bands, each filtered by specific dyes. Instead of using a single broad filter, multiple narrow-band filters target specific wavelengths (e.g., 445-480nm, 480-500nm) to reduce glare while preserving other spectral regions that contribute to color vision.
Solution Approach 2:
The patent applies local quality by using different dyes with specific absorption characteristics at different spectral locations. Each dye is selected to absorb light in a particular narrow band while allowing other wavelengths to pass, creating a non-uniform spectral transmission profile that selectively reduces glare without uniformly degrading color vision.
2Object-affected harmful factors
If blue light attenuation is increased to reduce discomfort, then glare relief is improved, but blue color perception deteriorates
Solution Approach 1:
The patent extracts only the harmful portion of blue light that causes glare discomfort while leaving the beneficial portions intact. By identifying and filtering only the specific wavelength ranges that contribute most to glare (using narrow-band dyes), the invention removes the harmful element without extracting the useful blue color information needed for perception.
3Loss of information
If high transmission is used to maintain color vision, then color perception is improved, but glare reduction deteriorates
Solution Approach 1:
The patent changes the spectral transmission parameters by introducing narrow-band absorption peaks at specific wavelengths while maintaining high transmission in other regions. The dyes are formulated with specific absorption maxima and bandwidths to create a transmission profile that simultaneously achieves high overall transmission and targeted glare reduction in critical wavelength regions.
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
These filters provide effective glare reduction while maintaining superior color vision quality, allowing users to perceive blue colors accurately and reducing discomfort from bright lights, thus enhancing overall visual experience and adherence to wearing the eyewear for extended periods.
Implementation Method 1
Lenses that attenuate wavelengths of light between 400 nanometers to 500 nanometers, and substantially transmit wavelengths of light between 500 nanometers to 700 nanometers, appear to have a yellow tint, or an orange tint, or a brown tint.
Implementation Method 2
Spectral glare control eyewear for color blindness and low vision assistance
Data Source
AI summary
The invention generally relates to optical filters that selectively attenuate the transmission of visible light for the purpose of enhancing or transforming the quality of human vision; to improved designs of such optical filters that provide an improved quality of color vision or of color perception; to methods of using such improved optical filters to enhance human vision during outdoor night time viewing conditions; to methods of using such improved optical filters to reduce the stimulation of the intrinsically photosensitive retinal ganglion cells (ipRGCs); to methods of using such improved optical filters to reduce the discomfort of glare; and to methods of using such improved optical filters to mitigate the symptoms of low vision or age-related visual impairments including for methods of treating or slowing the progression of persons with cone dystrophy including for persons with retinitis pigmentosa.