Intraocular Lens Position Prediction Using Capsular Bag Parameters
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Solution Overview
Problem
Current methods for selecting and positioning intraocular lenses (IOLs) in pseudophakic eyes are inadequate as they rely on simplified models and empirical correction factors, failing to accurately predict the postoperative anatomical position due to insufficient consideration of individual parameters and healing processes.
Innovation Solution
A method that incorporates additional parameters such as capsular bag diameter, capsulorhexis, preoperative decentration, lens tilting, haptic diameter, and haptic type into geometric-optic formulas or ray tracing to optimize the prediction of the postoperative lens position and orientation, using parameters not previously accounted for.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If simplified IOL formulas with empirical correction factors are used, then the calculation process is simple and quick, but the prediction accuracy of postoperative lens position is insufficient
Solution Approach 1:
The patent applies parameter changes by transitioning from simplified IOL formulas with few parameters to a comprehensive geometric-optic model that incorporates multiple parameters including capsular bag diameter, capsulorhexis diameter, lens haptic diameter, anterior chamber depth, corneal curvature, and axial length. This parameter expansion enables accurate prediction of postoperative lens position while maintaining computational feasibility through structured calculation approaches.
2Reliability
If only individual parameters are considered in IOL selection, then the selection process is straightforward, but systematic errors occur due to insufficient consideration of multiple interacting factors
Solution Approach 1:
The patent applies segmentation by dividing the IOL selection process into multiple independent evaluation components: capsular bag geometry assessment, lens haptic configuration analysis, capsulorhexis measurement, and biometric parameter integration. Each segment can be evaluated separately using specific formulas and then combined to produce the final prediction, improving reliability while managing complexity through modular structure.
Solution Approach 2:
The patent implements feedback mechanisms by using measured postoperative lens position data to validate and refine the prediction model. The geometric-optic formulas are adjusted based on actual surgical outcomes, allowing systematic errors to be identified and corrected in subsequent calculations, thereby improving reliability of IOL selection.
3Measurement precision
If additional parameters are incorporated into the calculation, then the prediction accuracy improves, but the calculation time and computational complexity increase
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing geometric relationships between capsular bag, lens haptics, and corneal surfaces based on standardized eye models. During surgical planning, these pre-computed geometric data are combined with patient-specific measurements through efficient formulas, reducing real-time calculation time while maintaining high accuracy through the incorporation of multiple parameters.
Data Source
AI summary
Postoperative lens position is predicted on the basis of known measured values, such as the corneal thickness, the depth of the anterior chamber, the eye length, and the distances of the capsular bag equator and/or of the lens haptic from the anterior surface of the lens. In addition, the calculation also takes into account the attitude of the intraocular lens, for which purpose additional parameters of the pseudophakic eye are used that have not previously been taken into consideration. The proposed method is suitable for a more exact prediction of the strength and nature of an intraocular lens to be implanted in a pseudophakic eye in the context of cataract surgery or of a refractive intervention. The method is based on the use of suitable calculation methods, e.g. geometric optical formulae, or of ray tracing.