Ophthalmic Lens Design Using Eye Rotation Coordinates
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Solution Overview
Problem
Existing methods for determining ophthalmic lenses do not accurately account for the individual wearer's specific eye position and natural gaze directions, leading to suboptimal power correction and visual comfort.
Innovation Solution
A method that measures three-dimensional coordinates of the eye's center of rotation and natural gaze directions in binocular vision, using these measurements to calculate and position the ophthalmic lens for precise power correction across different gaze areas, incorporating wavefront analysis or ray tracing for optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional lens determination methods are used, then manufacturing process is simple, but lens adaptation to individual wearer's eye position and gaze directions is poor
Solution Approach 1:
The patent applies preliminary action by measuring the wearer's eye position, center of rotation, and natural gaze directions before lens manufacturing. These measurements are used to pre-calculate the optimal lens characteristics tailored to the individual wearer, ensuring the lens is adapted to their specific anatomical and visual parameters before production begins.
Solution Approach 2:
The patent utilizes parameter changes by varying key lens parameters (power distribution, optical center position, axis orientation) based on the measured individual wearer parameters. The lens design parameters are dynamically adjusted according to the wearer's specific eye position, center of rotation coordinates, and habitual gaze directions, transforming a standardized approach into a customized solution.
2Manufacturing precision
If standardized lens determination is used, then manufacturing precision requirements are lower, but power correction accuracy for individual wearers is reduced
Solution Approach 1:
The patent replaces traditional mechanical/optical measurement systems with coordinate-based digital measurement and calculation methods. Instead of using complex optical instruments to directly determine lens parameters, the system uses digital coordinates of the eye's center of rotation and gaze directions to computationally derive the optimal lens characteristics, reducing measurement complexity while maintaining precision.
Solution Approach 2:
The patent creates a digital copy or model of the wearer's specific anatomical and visual parameters through measurement. This digital representation (coordinates of eye position, center of rotation, and gaze directions) is then used to generate the lens design, allowing precise replication of the optimal optical correction without requiring physical trial-and-error fitting procedures.
3Ease of operation
If individualized lens determination is implemented, then visual comfort is improved, but measurement and calculation time increases
Solution Approach 1:
The patent extracts only the essential parameters needed for lens determination: the coordinates of the eye's center of rotation and the directions of natural gaze. By focusing on these specific, critical parameters rather than comprehensive anatomical measurements, the system achieves individualized lens customization with minimal measurement time and computational effort.
Solution Approach 2:
The patent performs preliminary measurement of the wearer's eye position and gaze directions during the initial fitting consultation. These measurements are stored and used to calculate the optimal lens characteristics before manufacturing begins, eliminating the need for time-consuming adjustments and adaptations after lens production, thereby improving visual comfort while maintaining efficient workflow.
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 method provides ophthalmic lenses that are better adapted to the wearer's specific needs, offering improved visual comfort and precise power correction by accurately accounting for the eye's position and natural gaze directions.
Implementation Method 1
calculating the characteristics of the ophthalmic lens by using the coordinates measured for the center of rotation of the eye, the determined position of the lens and the at least one direction of gaze measured in a natural posture
Implementation Method 2
incorporating wavefront analysis or ray tracing for optimization
Data Source
AI summary
The present disclosure provides systems and methods for determining an ophthalmic lens. In one implementation, three-dimensional coordinates of a center of rotation of the wearer's eye measured on the wearer in binocular vision are received. At least one direction of gaze measured in a natural posture and a determined position of the ophthalmic lens are received. Characteristics of the ophthalmic lens are calculated by using the coordinates measured for the center of rotation of the eye, the determined position of the lens, and the at least one direction of gaze measured in a natural posture. The characteristics of the ophthalmic lens are calculated by positioning a starting ophthalmic lens in the determined position and modifying the starting ophthalmic lens by wavefront analysis and/or optimizing using ray tracing dependent on the coordinates measured for the center of rotation of the eye and the determined position of the lens.