Off-Axis Curvature Center Lens for Digital Eye Strain
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Solution Overview
Problem
Current spectacle lenses exacerbate digital eyestrain and convergence issues due to increased gaze-convergence angles, leading to discomfort, fatigue, and migraines from prolonged use of digital devices.
Innovation Solution
The development of convergence-reducing lenses with a near-vision region having an optical power within 0.5D of the distance-vision optical power, featuring a refractive design that reduces gaze-convergence angles by modifying the refraction angles and curvatures, allowing for a more relaxed eye rotation when focusing on near objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional spectacle lenses are used for near-vision, then optical power correction is provided, but gaze-convergence angles increase leading to eye strain and digital migraines
Solution Approach 1:
The patent applies local quality by creating distinct optical zones within the lens: a distance-vision region with standard optical power and a near-vision region with modified optical power within 0.5D of the distance-vision power. The near-vision region specifically modifies curvature centers to reduce gaze-convergence angles, while the distance-vision region maintains conventional optics. This localized differentiation allows the lens to provide appropriate optical correction for each viewing distance while minimizing harmful convergence effects during near-vision use.
2Adaptability or versatility
If bifocals or PALs are used to provide different optical corrections, then vision correction for multiple distances is achieved, but abrupt transitions or visible lines cause visual discomfort
Solution Approach 1:
The patent employs asymmetry in the optical design by positioning the near-vision region asymmetrically relative to the distance-vision region, with the near-vision zone optimized for reduced gaze-convergence angles. The curvature centers of the near-viction region are specifically offset to create asymmetric refraction patterns that reduce convergence demand. This asymmetric design allows smooth optical transitions between regions while providing tailored optical correction for each viewing distance, eliminating the abrupt transitions and visible lines characteristic of conventional bifocals.
3Ease of operation
If the eye focuses on near objects, then near-vision is achieved, but excessive muscle strain occurs due to increased convergence demands
Solution Approach 1:
The patent applies parameter changes by modifying the optical power parameter in the near-vision region to be within 0.5D of the distance-vision optical power, rather than using significantly higher power. This subtle parameter adjustment, combined with modified curvature centers in the near-vision zone, reduces the convergence demand on extraocular muscles while maintaining clear near-vision. The lens effectively changes the optical parameters to reduce the mechanical force required by eye muscles during near-vision tasks.
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, and proprioceptive disparity by minimizing the rotation of the eyes, providing relief from digital eyestrain and related discomforts without the need for frequent optical power corrections.
Implementation Method 1
configured to refract a light ray directed by a source to intersect a plane with a near-vision refraction angle, wherein an x-component of the near-vision refraction angle is smaller than an x-component of a distance-vision refraction angle
Data Source
AI summary
An off-axis curvature center lens is characterized by an x-y-z coordinate system of the convergence-reducing lens, the off-axis curvature lens comprising a distance-vision region with a non-negative distance-vision optical power, having a front distance-vision surface with a center of front distance-vision curvature, and a rear distance-vision surface with a center of rear distance-vision curvature; and a near-vision region with an optical power within 0.5D of the distance-vision optical power, having a front near-vision surface with a center of front near-vision curvature, and a rear near-vision surface with a center of rear near-vision curvature; wherein at least one of an x-coordinate of the center of front near-vision curvature is nasal relative to an x-coordinate of the center of front distance-vision curvature, and an x-coordinate of the center of rear near-vision curvature is temporal relative to an x-coordinate of the center of rear distance-vision curvature.