Intraocular Lens Selection via Ray Tracing and Biometric Modeling
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Solution Overview
Problem
Current methods for selecting intraocular lenses (IOLs) during refractive interventions primarily rely on average patient parameters, leading to systematic and statistical errors, and do not adequately consider individual patient-specific factors or post-operative effects, which can result in suboptimal refractive outcomes.
Innovation Solution
A method for pre-operative IOL selection using an eye model with individual biometric parameters, incorporating optical parameters like optical power, asphericity, and toricity, and calculating residual refraction through ray tracing, while considering additional parameters such as post-operative effects, surgical technique, and incision-related changes to improve selection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If average patient parameters are used for IOL selection, then the selection process is simplified, but systematic and statistical errors increase leading to suboptimal refractive outcomes
Solution Approach 1:
The patent applies local quality by transitioning from average population parameters to individual patient-specific parameters. The method calculates IOL optical power using patient-specific biometric measurements (axial length, corneal curvature, anterior chamber depth) and incorporates individual risk factors and post-operative expectations, thereby optimizing the refractive outcome for each specific patient rather than relying on population averages.
Solution Approach 2:
The patent applies preliminary action by performing comprehensive pre-operative calculations and simulations before IOL selection. The method calculates residual refraction, evaluates multiple IOL options with their expected outcomes, and allows patients to make informed decisions based on predicted results. This preliminary analysis reduces post-operative dissatisfaction and minimizes the need for additional corrective procedures.
2Measurement precision
If individual patient parameters are used for IOL selection, then refractive outcome accuracy is improved, but the selection process complexity increases
Solution Approach 1:
The patent replaces complex manual calculation and decision-making processes with an automated computational system. The method uses software to perform ray tracing simulations, calculate residual refraction, and evaluate multiple IOL options based on patient-specific parameters. This substitution of mechanical/manual processes with automated computational methods maintains high precision while reducing operational complexity for the surgeon.
3Measurement precision
If post-operative effects and surgical technique parameters are included in calculation, then selection accuracy is improved, but calculation complexity increases
Solution Approach 1:
The patent applies parameter changes by incorporating additional variables into the IOL calculation framework, including post-operative refractive targets, surgical technique parameters (incision type, IOL implantation method), and patient-specific risk factors. The system dynamically adjusts calculations based on these parameters to predict residual refraction and optimize IOL selection, thereby improving accuracy despite the increased number of parameters.
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
This approach simplifies the IOL selection process, reduces errors, and enhances the effectiveness of refractive interventions by accounting for individual patient needs and potential post-operative changes, leading to improved visual acuity and reduced reliance on surgeon experience.
Implementation Method 1
calculating the residual refraction by means of ray tracing
Data Source
AI summary
A method for the preoperative selection of an intraocular lens to optimise the results of refractive surgery on the eye. On the basis of an eye model comprising the individual biometric parameters of the eye, potentially suitable IOLs are selected on the basis of their optical parameters such as optical power, asphericity and toricity, and the residual refraction of potentially suitable IOLs is calculated using ray tracing. Various metrics, preferably retinal image metrics, are used to calculate the residual refraction and in order to improve the selection, at least one additional parameter is taken into consideration for the calculation, said calculation taking the postoperative effects of the selected IOL and/or of the surgical technique used into account.