Spectacle Lens Optical System Calculation Using Segmented Aberration and Distortion Targets
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Solution Overview
Problem
Current methods for calculating optical systems of spectacle ophthalmic lenses do not adequately account for aberrations and distortions, which can lead to suboptimal viewing experiences.
Innovation Solution
A method that calculates a spectacle ophthalmic lens using an optimization process combining aberration target lens data and distortion target values, minimizing quadratic differences in optical power, astigmatism, and distortion to enhance wearer satisfaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current methods for calculating optical systems are used, then the calculation process is simple, but the viewing experience is suboptimal due to inadequate accounting for aberrations and distortions
Solution Approach 1:
The optical system calculation is segmented into multiple optimization criteria: aberration control (sphere, astigmatism, higher-order aberrations) and distortion control (barrel, pincushion, mustache distortions). Each criterion is optimized separately through independent target lenses, allowing comprehensive control without excessive overall complexity
Solution Approach 2:
Target lenses are introduced as intermediary elements that define desired optical characteristics. The first target lens specifies aberration targets and the second target lens specifies distortion targets, serving as mediators between the wearer's requirements and the final lens design optimization process
2Measurement precision
If aberration control is optimized, then optical power accuracy improves, but distortion may increase
Solution Approach 1:
The optimization problem is divided into two independent segments: one focusing on aberration control (optical power, astigmatism) and another on distortion control. By using separate target lenses for each criterion, the method avoids the trade-off where optimizing one aspect deteriorates the other
Solution Approach 2:
The method changes optimization parameters by introducing distinct target values for aberrations and distortions. The first target lens provides aberration parameters (sphere, cylinder, axis) while the second target lens provides distortion parameters, allowing independent adjustment of each parameter set without conflict
Data Source
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AI summary
A method implemented by computer means for calculating a lens optical system (OS) of a spectacle ophthalmic lens for a wearer, wherein the method comprises the steps of: providing an aberration target lens (ATL) fulfilling the requirements of: ⋅ a first set of aberration data of the aberration target lens (ATL), ⋅ a first set of wearing parameters of the aberration target lens (ATL), and ⋅ a first set of lens parameters of the aberration target lens (ATL); providing a distortion target (DT) consisting of target distortion values where the target distortion values are reduced or enhanced in at least a modified distortions zone when compared to the distortion values of the aberration target lens (ATL); calculating the lens optical system (OS) by using an optimization method which jointly uses the aberration target lens and the target distortion values.