Progressive Lens Zone Sizing via Gaze Dynamics
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Solution Overview
Problem
Progressive lenses often suffer from aberrations in the non-clear areas, leading to lower optical quality and difficulty in focusing, especially due to unwanted astigmatism values greater than 0.50 Diopters.
Innovation Solution
A method to determine and calculate the size of the far, near, and intermediate areas of a progressive lens based on the dynamics of a user's gaze, using a virtual reality environment to record eye and head movements and process the data to define the lens areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the clear zones for far and near vision are enlarged, then the aberration zones are reduced, but the optical quality in the remaining aberration zones deteriorates due to higher astigmatism values
Solution Approach 1:
The patent applies local quality by measuring gaze dynamics in different spatial zones (far, near, intermediate) and assigning different optical characteristics to corresponding lens regions. Each zone is optimized independently based on the user's actual gaze behavior patterns, allowing the lens to provide tailored optical properties where needed while maintaining clarity in aberration-prone areas.
Solution Approach 2:
The patent introduces dynamics by using measurable gaze parameters (horizontal and vertical amplitudes, frequency of use) to dynamically determine lens zone dimensions. The lens design adapts to the user's individual gaze dynamics rather than using fixed standard zones, allowing the clear zones to be strategically positioned and sized based on actual usage patterns.
2Ease of manufacture
If standard fixed-zone lens designs are used, then manufacturing is simplified, but the lens cannot be optimized for individual user gaze dynamics
Solution Approach 1:
The patent applies parameter changes by using measurable gaze dynamics parameters (amplitudes, frequencies, temporal patterns) to calculate customized zone dimensions. The lens design transitions from fixed geometric parameters to dynamically determined parameters based on individual user behavior, enabling personalization while maintaining a systematic design framework.
Solution Approach 2:
The patent implements self-service by having the lens design process automatically adapt to the user's gaze characteristics through measurement and calculation. The system self-adjusts the zone dimensions based on the user's gaze dynamics without requiring manual intervention or subjective input, enabling objective customization.
3Ease of operation
If the intermediate zone corridor is widened, then the transition between far and near vision is smoother, but the clear zone areas for far and near vision are reduced
Solution Approach 1:
The patent applies segmentation by dividing the lens into distinct functional zones (far vision, near vision, intermediate vision) based on gaze dynamics measurements. Each zone is independently optimized for its specific function, allowing the intermediate zone to be strategically positioned to provide smooth transitions while preserving adequate clear zone areas for primary viewing distances.
Data Source
AI summary
Method to establish the size of the zones of near Ac, far AL and intermediate Ai vision of a progressive lens by generating, thanks to virtual reality, a gaze map of the user while following a stimulus in at least two planes at two different distances. Once the gaze maps have been made in those two planes or more, the area of each zone is calculated from the maximum horizontal and vertical amplitudes and the points of maximum frequency. In this way, the lens is adapted to the way a user looks.