Progressive Lens Design Selection Balancing Vision Areas
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Solution Overview
Problem
Current progressive addition lenses with balance type designs often fail to satisfy users due to trade-offs between distant and near vision areas, leading to distortion and blurring, and are limited in versatility for various activities, prompting a need for a method to select a lens design standard that balances distance and near vision areas effectively.
Innovation Solution
A method for selecting a lens design standard from a basic design distribution group and corridor length, considering prescription information, life environmental factors, frame shape, and user-specific parameters to optimize the distribution of distance and near vision areas, reducing distortion and blurring while enhancing versatility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the clearly viewable vision areas are widened, then the user satisfaction with distance and near vision is improved, but the distortion and blurring of image in the lateral portion increases
Solution Approach 1:
The patent applies parameter changes by systematically varying multiple lens design parameters including basic design distribution (aberration distribution, average power distribution), corridor length, and refractive index. By changing these parameters based on user-specific conditions (age, career, hobby, spectacles-wearing history), the lens optimizes the balance between clearly viewable vision area width and image quality, resolving the contradiction between area expansion and distortion reduction.
2Area of stationary object
If the clearly viewable vision areas are widened, then the user satisfaction is improved, but the fluctuation of image caused while the user moves line-of-sight increases
Solution Approach 1:
The patent uses parameter changes to adjust the basic design distribution and corridor length based on user conditions. By modifying the aberration distribution and average power distribution parameters, the lens reduces image fluctuation during line-of-sight movement while maintaining expanded clearly viewable vision areas, thus resolving this contradiction.
3Reliability
If the progressive addition lens is designed for specific use requirements, then the performance for that specific use is improved, but the versatility for other purposes deteriorates
Solution Approach 1:
The patent implements universality by creating a lens selection system that adapts to multiple different use scenarios. By categorizing users into different groups based on their primary activities (outdoor sports, reading, desk work, general use) and providing optimized lens designs for each category, the system achieves multi-functionality. The lens design can be universally applied across different user needs by selecting appropriate parameters from the basic design distribution group.
Data Source
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AI summary
The present invention is made to provide a method for selecting a balance between a distance vision area and a near vision area and a corridor length of a progressive addition lens in consideration of elements other than life conditions, spectacles-wearing history and use conditions of a user. The method includes preparing design variations which consist of a plurality of basic design distribution groups different from each other in area-division between the distance vision area and the near vision area, and a plurality of corridor lengths different from each other. The method also includes inputting parameters originating from prescription information, life environmental information, frame shape information and the like, selecting a basic design distribution group and a corridor length based on the aforesaid inputted information, and obtaining a lens design standard based on the selected basic design distribution group and corridor length. As parameters, a distance between a vertex of a rear surface of a right progressive addition lens and a vertex of a cornea of a right eye and a distance between a vertex of a rear surface of a left progressive addition lens and a vertex of a cornea of a left eye are included in setting elements.