Convergence-Reducing Lens with Off-Axis Curvature Centers
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Solution Overview
Problem
Current spectacle lenses fail to adequately address digital eye strain and convergence-related discomforts caused by prolonged use of digital devices, leading to fatigue, headaches, and migraines, as they do not effectively reduce gaze convergence angles and proprioceptive disparities.
Innovation Solution
The development of convergence-reducing lenses with a distance-vision region and a near-vision region having matching optical powers within 0.5 diopters, where the near-vision region is configured to refract light with a smaller gaze-convergence angle, reducing the need for eye rotation and alleviating muscle strain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional spectacle lenses are used for distance vision, then distance vision is corrected, but near vision causes excessive eye convergence and muscle strain
Solution Approach 1:
The spectacle lens is divided into two distinct functional zones: a distance vision zone with negative optical power and a near vision zone with zero or positive optical power. This segmentation allows each zone to independently optimize its optical function, reducing the need for excessive eye convergence when viewing near objects while maintaining proper distance vision correction
Solution Approach 2:
Different regions of the lens are assigned different optical properties tailored to their specific viewing purposes. The distance vision zone has negative dioptric power for distant object correction, while the near vision zone has zero or positive dioptric power to minimize convergence demand for close objects. This local differentiation of optical quality resolves the contradiction between distance correction and near vision comfort
2Adaptability or versatility
If bifocals or progressive lenses are used to correct both distance and near vision, then both vision regions are corrected, but the transition between regions causes visual discomfort and proprioceptive disparity
Solution Approach 1:
The invention extracts the near vision correction function from the traditional single-lens design and creates a separate near vision zone with distinct optical properties. By giving the near vision zone zero or positive optical power rather than attempting gradual transition, the design eliminates the proprioceptive disparity and visual discomfort associated with bifocal and progressive lens transitions
Solution Approach 2:
Instead of using negative power for near vision (which increases convergence demand) or gradual transitions (which cause proprioceptive conflict), the invention inverts the approach by using zero or positive optical power in the near vision zone. This reversal of the traditional power gradient eliminates transition discomfort while maintaining dual vision correction capability
3Reliability
If negative power lenses are used for near vision, then optical correction is provided, but gaze convergence angle increases causing digital eye strain
Solution Approach 1:
The invention changes the optical power parameter in the near vision zone from negative (traditional) to zero or positive values. This parameter change fundamentally alters the lens's effect on light rays, reducing the induced gaze convergence angle and thereby eliminating digital eye strain while preserving necessary optical correction through the distance vision zone's negative power
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 significantly reduce eye strain, digital migraines, Computer Vision Syndrome, and Chronic Daily Headaches by minimizing gaze convergence angles, providing relief for a broader population, including those without optical power corrections.
Implementation Method 1
The convergence-reducing lens is configured to refract light with a smaller gaze-convergence angle
Data Source
AI summary
A convergence-reducing lens, wherein a central normal defines a z-axis, and a central region defines an x-y plane, together defining an x-y-z coordinate system, the convergence-reducing lens comprising a distance-vision region with a negative distance-vision optical power, having a distance-vision front surface with a center of distance-vision front curvature, and a distance-vision rear surface with a center of distance-vision rear curvature; and a near-vision region with an optical power within 0.5 D of the distance-vision optical power, having a near-vision front surface with a center of near-vision front curvature, and a near-vision rear surface with a center of near-vision rear curvature; wherein at least one of an x-coordinate of the center of near-vision front curvature is nasal relative to an x-coordinate of the center of distance-vision front curvature, and an x-coordinate of the center of near-vision rear curvature is temporal relative to an x-coordinate of the center of distance-vision rear curvature.