Convergence-reducing spectacle lenses for digital eye strain
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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 other visual disorders, as they do not effectively reduce gaze convergence angles and proprioceptive disparities.
Innovation Solution
The development of convergence-reducing spectacle lenses with a distance-vision region having negative optical power and a near-vision region with matching optical power within 0.5 diopters, designed to refract light rays in a way that reduces gaze convergence angles, thereby alleviating eye strain and related discomforts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional spectacle lenses are used for near-vision correction, then near-vision clarity is improved, but gaze convergence angle increases causing eye strain and digital migraines
Solution Approach 1:
The spectacle lens incorporates different optical power regions: a distance-vision region with negative optical power and a near-vision region with zero or positive optical power. This local differentiation allows the lens to provide appropriate optical correction for each viewing distance while the negative power distance region specifically reduces gaze convergence angles to alleviate eye strain and convergence discomfort during digital device usage.
2Adaptability or versatility
If bifocals or PALs are used to correct presbyopia, then both distance and near vision are improved, but abrupt transitions between vision regions cause visual discomfort
Solution Approach 1:
The lens provides different optical powers in different regions (distance vs. near vision zones) to correct presbyopia, similar to bifocals and PALs. However, it introduces a progressive optical power distribution that creates smooth transitions between regions, eliminating the abrupt changes and visible lines characteristic of traditional bifocals, thereby reducing visual discomfort at transition zones.
3Object-affected harmful factors
If negative power lenses are used to reduce convergence, then gaze convergence angle is reduced, but near-vision optical correction is insufficient
Solution Approach 1:
The lens applies negative optical power specifically in the distance-vision region to reduce gaze convergence angles, while the near-vision region provides zero or positive optical power to ensure adequate near-vision correction. This spatial separation of optical functions allows simultaneous achievement of convergence reduction and proper near-vision correction without compromise.
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 the rotation of the eyes, providing relief from muscle strain and misalignment issues.
Implementation Method 1
a distance-vision region, having a negative distance-vision optical power, configured to refract a light ray, directed parallel to the z-axis 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 parallel to the z-axis at a near-vision region point
Data Source
Figure 1A~1B
Figure 2A
Figure 2B
AI summary
A convergence-reducing lens, wherein a central normal of the convergence-reducing lens defines a z-axis (3), and a center of the convergence-reducing lens defines a tangential, centered x-y plane, together defining a coordinate system, the convergence-reducing lens comprising a distance-vision region, having a negative distance-vision optical power, to refract a light ray, directed from an object point (11) at an x-distance from a x-z plane of the coordinate system, so that its extension intersects the x-z plane at a distance-vision intersection x-distance Xpd to be refracted towards an image point of the object through r^the eye lens center; and a near-vision region, having a near-vision optical power that matches the distance-vision optical power within 0.5D, to refract a light ray, directed from the object point so that its extension intersects the x-z plane at a near-vision region intersection x-distance Xpn, at a corresponding y height, to be refracted towards an image point of the object through the eye lens center, so that the convergence angle between the z-axis and the interscetion point of the near distance region is smaller than the convergence angle of the distance vision intersection point and the z-axis.