Negative Power Lens for Digital Eye Strain Reduction
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Solution Overview
Problem
The increasing digital lifestyle has led to excessive eye strain and discomfort due to prolonged focus on near-vision targets, such as digital screens, with existing solutions providing insufficient relief from digital eye strain, Computer Vision Syndrome, and Chronic Daily Headaches, as they do not adequately address the root causes of gaze convergence and misalignment between visual systems.
Innovation Solution
The development of eye-strain-reducing spectacle lenses with a convergence-reducing design, featuring a distance-vision region with negative optical power and a near-vision region with matching optical power within 0.5 diopters, which refract light rays to reduce gaze convergence angles, thereby alleviating muscle strain and associated discomforts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional reading glasses or bifocals are used to correct near-vision refraction errors, then near-vision clarity is improved, but eye strain and muscle fatigue increase due to excessive convergence demands
Solution Approach 1:
The patent changes the optical power parameter in the near-vision region to match the distance-vision optical power, eliminating the traditional positive addition power. This parameter change reduces the convergence demand on eye muscles while maintaining clear near vision, thereby resolving the contradiction between near-vision clarity and eye strain reduction
Solution Approach 2:
The patent applies different optical properties to different regions of the lens: the distance-vision region maintains negative optical power for distance correction, while the near-vision region has optical power matching the distance region. This local differentiation allows each region to optimize for its specific function without causing excessive convergence strain
2Adaptability or versatility
If bifocals or progressive addition lenses are used to provide different optical corrections for near and distance vision, then vision correction across multiple distances is improved, but the transition between regions may be abrupt or require frequent glass exchange
Solution Approach 1:
The patent merges the optical power of the near-vision region with the distance-vision region, creating a unified optical design where both regions have matching negative optical power. This eliminates the abrupt transitions and power jumps characteristic of traditional bifocals and PALs, providing smooth visual adaptation while maintaining multi-distance correction capability
3Productivity
If the eye focuses continuously on near-vision targets such as digital screens, then digital work productivity is maintained, but excessive demands on eye muscles lead to fatigue, discomfort, and headaches
Solution Approach 1:
The patent changes the optical power parameter in the near-vision region to match the distance-vision optical power, eliminating the traditional positive addition power. This parameter change reduces the convergence demand on eye muscles while maintaining clear near vision, thereby resolving the contradiction between near-vision clarity and eye strain reduction
Solution Approach 2:
The lens acts as an intermediary device that modifies the optical path to reduce convergence demand. By introducing this optical mediator with matched negative power in both regions, the eye muscles are relieved from excessive convergence efforts during prolonged near-work, extending muscle endurance while maintaining productivity
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 lenses effectively reduce eye strain, digital migraines, Computer Vision Syndrome, and Chronic Daily Headaches by minimizing gaze convergence angles, providing significant relief and extending the market reach beyond bifocal users to monovision lens wearers and those without optical power corrections.
Implementation Method 1
a distance-vision region, having a negative distance-vision optical power, configured to refract a light ray, directed by a source at a distance-vision region point
Implementation Method 2
a near-vision region, having a near-vision optical power that matches the distance-vision optical power within 0.5 D, configured to refract a light ray, directed by the source at a near-vision region point
Data Source
AI summary
An eye-strain reducing lens is characterized by an x-y-z coordinate system, and includes a distance-vision region, having a negative distance-vision optical power, configured to refract a light ray, directed by a source at a distance-vision region point at a distance-vision x-distance from a center of the coordinate system, to propagate to an eye-center-representative location; and a near-vision region, having a near-vision optical power that matches the distance-vision optical power within 0.5 D, configured to refract a light ray, directed by the source at a near-vision region point at a near-vision x-distance from the center of the coordinate system, to propagate to an x-z location of the eye-center representative location at a corresponding y height; wherein the near-vision x-distance is smaller than the distance-vision x-distance.