Customized Progressive Lens Head Movement Adaptation
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Solution Overview
Problem
Existing progressive power ophthalmic lenses are not adequately customized to account for the wearer's dynamic vertical head movements during far vision, leading to unsuitable visual correction and discomfort when looking at distant objects, especially when moving.
Innovation Solution
A method that involves measuring the wearer's head inclination angles during different visual tasks while walking and performing tasks at varying distances, adjusting the optical power along the meridian line to accommodate these movements, and producing the lens to include intermediate sight directions that account for these adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If progressive power lenses are designed with standard optical power distribution, then manufacturing is simplified and cost is reduced, but the lenses do not accommodate dynamic head movements during far vision, causing visual discomfort
Solution Approach 1:
The patent applies dynamics by making the lens optical design adaptable to dynamic head movements. The lens incorporates multiple intermediate sight directions that correspond to different head inclination angles, allowing the optical power distribution to effectively change based on the wearer's natural head movement patterns during far vision activities.
Solution Approach 2:
The patent changes the optical power parameters along the meridian line to accommodate different head inclination angles. By introducing intermediate sight directions with specific optical power values, the lens transforms the static optical power distribution into a dynamic one that adapts to varying head positions during far vision.
2Ease of operation
If the lens is customized to account for vertical head movements during near vision, then near vision comfort is improved, but far vision comfort when moving is not adequately addressed
Solution Approach 1:
The patent applies universality by designing the lens to serve multiple vision conditions simultaneously. The same lens design accommodates both near vision (through the existing reference direction for near vision) and far vision during movement (through multiple intermediate sight directions), making the lens universally adaptable to different wearing conditions and activities.
3Manufacturing precision
If the lens design follows conventional static measurement methods, then manufacturing precision is maintained, but the lens does not capture dynamic head movement patterns, reducing customization effectiveness
Solution Approach 1:
The patent applies preliminary action by measuring the wearer's head inclination angles during dynamic far vision activities before lens production. These pre-measured angular positions are then used to define the intermediate sight directions in the lens design, ensuring that the lens is customized to the wearer's actual movement patterns rather than assuming static positions.
4Ease of operation
If intermediate sight directions are added to accommodate dynamic head movements, then far vision comfort during movement is improved, but the lens design and production process becomes more complex
Solution Approach 1:
The patent applies local quality by introducing specific optical power values at particular intermediate sight directions along the meridian line, while maintaining the standard optical power distribution in other regions. This localized customization approach adds complexity only where needed (at the intermediate sight directions corresponding to measured head inclination angles) while preserving the simplicity of conventional lens design in other areas.
Data Source
AI summary
A method makes a customized progressive ophthalmic lens intended for an identified wearer that includes measurements of the inclination of the wearer's head. These measures are made when the wearer performs visual tasks in far-vision conditions, by consecutively looking horizontally, then towards the ground. A variation of the optical power of the progressive lens, below a reference direction for the far vision, is adjusted on the basis of the measure results. The habituation period of the wearer to the progressive lens can thus be reduced.