Progressive Ophthalmic Lens Aberration Redistribution
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Solution Overview
Problem
Conventional progressive ophthalmic lenses do not effectively manage optical aberrations in the top and bottom areas, leading to discomfort due to unavoidable lateral aberrations, as these areas are not optimized for the specific frame chosen by the user, resulting in aberrations within the useful area.
Innovation Solution
A procedure that calculates and redistributes lens power progression associated astigmatism by distinguishing between useful and outer areas, allowing higher aberration values in outer areas to be eliminated during bevelling, thereby reducing aberrations within the useful area, using a merit function and weight functions to optimize aberration distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional progressive lens design is used without frame-specific optimization, then the lens can be manufactured with standard procedures, but optical aberrations remain high within the useful area causing user discomfort
Solution Approach 1:
The patent applies local quality by differentiating the optimization treatment between top and bottom areas of the lens based on their specific functional requirements. The top area is optimized for far vision with specific aberration control, while the bottom area is optimized for near vision with different aberration characteristics. This localized optimization reduces overall lateral aberrations within the useful area while maintaining manufacturing feasibility through automated computer-controlled processes.
2Productivity
If the lens is designed without considering the specific frame chosen by the user, then the design process is simpler and faster, but the optical aberrations cannot be effectively distributed for the user's specific visual needs
Solution Approach 1:
The patent implements preliminary action by pre-defining the top and bottom areas based on the selected frame dimensions and position data before performing the optimization calculation. The system automatically determines the vertical extent of each area according to the frame's geometric parameters, allowing the optimization algorithm to work with pre-specified regions. This approach maintains high productivity by avoiding manual intervention while achieving precise aberration distribution tailored to the user's frame and visual requirements.
3Extent of automation
If automated optimization algorithms are used without considering frame data, then the calculation process is faster, but the aberration distribution does not account for the user's specific frame geometry
Solution Approach 1:
The patent applies universality by creating a multi-functional optimization system that simultaneously processes frame geometric data, user physiological data, and optical performance requirements through a single automated algorithm. The system universally handles different frame shapes and sizes by converting them into standardized top and bottom area definitions, then applies the same optimization principles across all cases. This maintains high automation while achieving frame-specific adaptation through the universal processing of frame parameters.
Data Source
AI summary
Method for designing a progressive ophthalmic lens with a top area between a vision area and a top edge of the lens, and a bottom area between a near vision area and a bottom edge of the lens. Selecting a predesigned lens, lateral aberrations which are redistributed around an outer area, defined according to a frame chosen by the lens user, so that at least on one of intersections between top, bottom and outer areas, the aberrations adopt values higher than those in the predesigned lens.