Progressive Lens Design Using Wearer Posture Data
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Solution Overview
Problem
Wearers of progressive spectacle eyeglasses often experience discomfort and fatigue during the adaptation period due to differences in design, which require changes in head posture when switching from one eyeglass to another, as each design is tailored to specific head inclinations and observation positions.
Innovation Solution
A method to produce personalized progressive eyeglasses by characterizing a reference eyeglass with postural parameters from the wearer's measurements, calculating a corrected mean and standard deviation, and using these values to determine a customized design that aligns with the wearer's natural observation postures, reducing the need for abrupt changes in head position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a standardized progressive eyeglass design is used, then manufacturing cost and complexity are reduced, but wearer comfort and adaptation ease deteriorate due to mismatch with individual postural habits
Solution Approach 1:
The patent applies parameter changes by adjusting the optical design parameters (progression length, corridor shape, optical power distribution) based on measured postural parameters (head inclination angle, gaze direction, observation distance). This allows the eyeglass design to be customized to match each wearer's natural posture, resolving the contradiction between standardized manufacturing and personalized comfort.
Solution Approach 2:
The patent implements preliminary action by measuring the wearer's postural parameters before producing the eyeglasses. This advance measurement and customization of the optical design based on individual habits eliminates the need for adaptation period, as the glasses are pre-configured to match the wearer's natural observation positions.
2Ease of operation
If the eyeglass design is customized to match wearer's postural habits, then adaptation comfort is improved, but measurement complexity and production time increase
Solution Approach 1:
The patent applies self-service by having the wearer naturally perform their typical observation activities during the measurement process. The postural parameters are captured during normal use conditions without requiring the wearer to adopt artificial positions or follow complex measurement protocols, thereby simplifying the measurement process while maintaining customization accuracy.
Solution Approach 2:
The patent reduces complexity by focusing measurements on key postural parameters (head inclination, gaze direction) that directly influence optical design, rather than measuring all possible movement variables. This selective parameter approach maintains customization effectiveness while minimizing measurement and production complexity.
3Measurement precision
If multiple measurement sessions are conducted to capture variable postural positions, then measurement accuracy is improved, but time consumption and process complexity increase
Solution Approach 1:
The patent implements periodic action by conducting multiple measurements at different time points to capture the natural variability in postural habits. This allows accurate characterization of the wearer's typical observation positions while accounting for temporal variations, ensuring the eyeglass design adapts to genuine habits rather than transient postures.
Solution Approach 2:
The patent maintains continuity of useful action by having the wearer engage in natural observation activities throughout the measurement process rather than pausing between measurements. This captures authentic postural behavior in continuous context, improving measurement accuracy without requiring lengthy interruptions or artificial measurement setups.
Data Source
AI summary
The invention relates to a method for producing a novel progressive glasses lens intended for a presbyopic wearer, which takes into account the postural habits of the wearer, acquired through prior conditions of ophthalmic correction. A design for the novel progressive lens is established by modifying a reference lens in compliance with an aptitude of the wearer to modify his/her postural habits. To this end, variations in a postural parameter are determined using measurements of said parameter, which are carried out on the wearer. The invention enables the reduction of a period of habituation by the wearer to the novel progressive glasses lens.