Wearer-Specific Progressive Lens Meridian Angles for Vertigo Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing progressive addition lenses (PALs) induce vertigo and motion sickness due to aberrations in peripheral regions, with varying sensitivity among wearers to motion in different directions.
Innovation Solution
A method and system for determining a progressive lens design that reduces postural instability by measuring a wearer's sensitivity to motion in anterior-posterior and mediolateral directions, adjusting the angle of the meridian line's inclined portion and distributing progression profiles based on these measurements to minimize aberrations and discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a progressive lens is designed with a standard meridian line configuration, then the lens provides corrected vision at distance and near zones, but it induces vertigo and motion sickness due to peripheral aberrations
Solution Approach 1:
The patent applies local quality by customizing the meridian line configuration (specifically the angle of the inclined portion) according to the individual wearer's postural instability sensitivity. Instead of using a universal lens design, the solution tailors the optical properties in the progression zone to match the specific wearer's physiological characteristics, thereby reducing peripheral aberrations and their harmful effects for each individual.
Solution Approach 2:
The patent implements parameter changes by adjusting the angle of the inclined portion of the meridian line based on measured postural instability sensitivity. The method modifies this specific geometric parameter of the lens design to optimize visual comfort and reduce vertigo, transforming a fixed design parameter into a variable that adapts to individual wearer characteristics.
2Ease of operation
If the meridian line inclined portion angle is adjusted to reduce postural instability, then wearer comfort improves, but lens design complexity increases
Solution Approach 1:
The patent applies preliminary action by measuring the wearer's postural instability sensitivity before lens manufacturing and using this information to pre-determine the optimal meridian line angle. This advance measurement and customization process eliminates the need for trial-and-error fitting, making the complex customized lens design process more efficient and streamlined.
Solution Approach 2:
The system implements self-service by using the wearer's own physiological responses (postural instability measurements) to automatically determine the optimal lens parameters. The wearer's body effectively 'selects' the appropriate design configuration through objective measurement, reducing the need for subjective optometrist judgment and standardizing the customization process.
3Reliability
If progressive lens designs are optimized for different viewing behaviors and activities, then vision performance improves, but the number of design options and selection complexity increases
Solution Approach 1:
The patent implements feedback by using objective physiological measurements (postural instability sensitivity) to guide lens design selection. Instead of relying on subjective wearer preferences or optometrist experience, the system uses measurable physiological responses to determine the optimal design parameters, creating a data-driven feedback loop that objectively matches wearer characteristics to lens configurations.
Data Source
AI summary
A method for determining a design of a progressive lens intended to be worn by a future wearer, the progressive lens comprising a front surface and a back surface, at least one of the front surface and the back surface comprising a progression profile on its general spherical shape, said at least one progression profile defining a meridian line extending from a distance-vision point to a near-vision point, said meridian line comprising a vertical portion passing through the distance-vision point and an inclined portion passing through the near-vision point, the vertical portion and the inclined portion forming an angle between them, the method comprising obtaining first data representative of a first measurement of a first postural instability of the future wearer when seeing at a visual pattern moving along an anterior-posterior direction, and determining the angle of the inclined portion based on the first data.