Computer Eyewear Spectral Filtering for CVS Relief
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Solution Overview
Problem
Computer Vision Syndrome (CVS) symptoms such as blurred vision, headaches, musculoskeletal pain, eye strain, dry eyes, and light sensitivity arise from prolonged focus on computer screens due to increased eye muscle contraction and reduced blinking, exacerbated by dry air and extraneous light.
Innovation Solution
Computer eyewear with lenses providing spectral filtering, featuring a transmission curve with a stop band, plateau regions, and ramp regions to reduce light transmission, along with a wrap-around design to shield eyes and prevent dryness, and optional side-shields to block extraneous light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If spectral filtering is applied to reduce blue light transmission, then eye strain and light sensitivity are reduced, but overall light transmission and brightness are decreased
Solution Approach 1:
The lens applies selective spectral filtering with different transmission characteristics at different wavelengths. The transmission curve is engineered to provide strong attenuation in the blue light range (400-450 nm) while maintaining higher transmission in the green-yellow range (500-560 nm), achieving local optimization of light transmission quality rather than uniform filtering across all wavelengths.
Solution Approach 2:
The patent specifies precise transmission curve parameters including a stop band at 400-450 nm with T90 width of 30-50 nm, and a plateau region at 500-560 nm with transmission T20-T80 ≥ 0.70. These parameter changes optimize the balance between blue light blocking and overall light transmission, resolving the contradiction between reducing harmful blue light and maintaining sufficient brightness.
2Ease of operation
If optical power is increased to reduce accommodative demand, then eye muscle contraction is reduced, but depth of field and focusing precision are decreased
Solution Approach 1:
The patent applies partial action by using low positive optical power (+0.25 to +0.75 D) rather than full correction. This partial optical power reduction provides sufficient relief for digital device viewing distance while maintaining adequate focusing precision for distant objects, avoiding the excessive action that would compromise depth of field and focusing accuracy.
3Object-affected harmful factors
If wrap-around design is used to shield eyes from extraneous light, then light sensitivity symptoms are reduced, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The wrap-around frame design utilizes curved geometry to extend lateral shielding coverage. The curved frame structure naturally follows the contour of the face and provides enhanced peripheral light blocking without requiring additional complex components, achieving improved protection through elegant geometric form rather than structural complexity.
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 eyewear reduces accommodative and vergence demands on the eyes, mitigates eye strain, and enhances comfort by reducing light exposure and air dryness, thereby alleviating CVS symptoms.
Implementation Method 1
Each lens provides spectral filtering characterized by a transmission curve. The transmission curve includes a stop band portion positioned between about 320 nm to about 400 nm. The stop band portion reduces transmitted light by at least about 95% on average.
Implementation Method 2
Each lens can include a yellow tint to contribute to the spectral filtering.
Data Source
AI summary
Various embodiments of computer eyewear include optical treatments to provide a relaxing, calming, and soothing light environment for the eye. Certain embodiments of computer eyewear include a frame and two lenses. Each lens in these embodiments has optical power in the range from about +0.1 to about +0.5 diopters, and provides spectral filtering characterized by a transmission curve. The transmission curve includes a stop band portion positioned between about 320 nm to about 400 nm, a first plateau region positioned between about 420 nm to about 450 nm, a ramp region positioned between about 470 nm to about 560 nm, and a second plateau region positioned between about 570 nm to about 680 nm.