Lens Optical Power Mapping for Complex Myopia Control Designs
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Solution Overview
Problem
Existing methods struggle to accurately characterize lens elements with complex optical designs, such as those containing microlenses or lenslets, which are designed to slow down or prevent the progression of abnormal refraction in eyes, particularly in children, due to their intricate nature and the need for precise optical power distribution.
Innovation Solution
A method using deflectometry or fringe projection profilometry to create a two-dimensional representation of the local optical power of lens elements, allowing for accurate characterization of optical elements, including those with multiple powers and positions, by analyzing histogram data and applying filters to enhance precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional characterization methods are used for lens elements with complex optical designs (microlenses, lenslets), then the characterization process becomes inaccurate and unreliable, but implementing new advanced characterization methods increases device complexity and measurement difficulty
Solution Approach 1:
The patent segments the complex lens element into multiple zones (central zone with refraction islands and peripheral zone with optical elements). By characterizing each zone separately with appropriate methods and criteria, the overall characterization accuracy improves while managing the complexity of measurement.
Solution Approach 2:
The patent applies different characterization criteria and methods to different zones of the lens element. The central zone uses refraction island density and size criteria, while the peripheral zone uses optical element power and distribution criteria. This localized approach ensures accurate characterization of each region's specific optical properties.
2Reliability
If traditional characterization methods are used for lens elements with contiguous small-diameter optical elements, then the characterization is insufficient and unreliable, but adopting new methods increases device complexity
Solution Approach 1:
The patent divides the lens element into distinct zones (central and peripheral) and applies zone-specific characterization methods. This segmentation allows reliable characterization of contiguous small-diameter optical elements by treating them as a collective peripheral zone rather than attempting to measure each individual element, thus improving reliability without excessive complexity.
Solution Approach 2:
The patent applies characterization criteria that are sufficient for the specific zone rather than attempting complete characterization of all elements. For the peripheral zone with contiguous small elements, statistical parameters (density, distribution, power ranges) are used instead of individual element measurement, providing reliable overall characterization without excessive complexity.
3Manufacturing precision
If comprehensive characterization of all optical elements is performed, then manufacturing precision is improved, but the characterization time and productivity are reduced
Solution Approach 1:
The patent segments characterization into zone-specific processes that can be performed independently and in parallel. The central zone and peripheral zone are characterized using different methods and criteria, allowing faster overall characterization while maintaining precision for each zone's specific requirements.
Solution Approach 2:
The patent applies characterization criteria that are sufficient for quality control rather than exhaustive measurement of every parameter. Statistical parameters and range checks are used instead of complete individual element characterization, maintaining manufacturing precision while significantly improving characterization speed and productivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables quick and efficient characterization of lens elements with complex optical designs, ensuring compliance and optimizing manufacturing processes, thereby effectively controlling abnormal refraction progression.
Implementation Method 1
obtaining a two-dimension representation of the local optical power of at least part of the lens element using deflectometry method
Implementation Method 2
obtaining a two-dimension representation of the local optical power of at least part of the lens element using deflectometry method
Data Source
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AI summary
Method for characterizing at least part of a lens element, for example a myopia control lens element, adapted for a wearer, said lens element providing a first optical function having a refractive power based on the prescription of the wearer, and comprising a plurality of optical elements, each optical element of the plurality of optical elements providing one or more optical functions, at least one of which is different from the first optical function; wherein the method comprises: - obtaining a two-dimension representation of the local optical power of at least part of the lens element using a deflectometry method or fringe projection profilometry, - determining the optical power distribution over at least part of the two-dimension representation of the lens element in the form of a representation of the data as a histogram or a stem-and-leaf plot; and - characterizing at least the part of the lens element within said at least part of the two-dimension representation of the lens element by analyzing the representation of the data, for example characterizing the histogram or stem-and-leaf plot.