Ocular Implant Power Calculation Using Dual Adjustment Values
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Solution Overview
Problem
Current methods for characterizing ocular implants to predict refractive correction post-surgery are unsatisfactory as they fail to provide reliable values, leading to significant prediction errors due to the use of single adjustment values that do not minimize dispersion of errors.
Innovation Solution
A process and device that utilize two adjustment values to minimize dispersion and bias of prediction errors, where the first value adjusts to minimize prediction error dispersion and the second value cancels bias, ensuring accurate and precise predictions by determining the optical performance and power of ocular implants based on biometric measurements and reference systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single adjustment value is used to optimize prediction of implant power, then the prediction process is simple, but the prediction reliability and precision are insufficient
Solution Approach 1:
The patent divides the adjustment process into two separate adjustment values: a first adjustment value to minimize dispersion of errors and a second adjustment value to cancel bias. This segmentation allows each adjustment value to focus on a specific aspect of error reduction, thereby improving overall prediction reliability without excessive complexity.
Solution Approach 2:
The patent changes the approach from using a single adjustment parameter to using two distinct adjustment parameters (first adjustment value and second adjustment value). Each parameter addresses a different aspect of prediction error, enabling more precise and reliable predictions while maintaining computational feasibility.
2Measurement precision
If adjustment constants are used to minimize prediction error, then the average quadratic error or average absolute error is reduced, but the dispersion of errors remains high
Solution Approach 1:
The patent segments the error adjustment into two independent components: minimizing dispersion through the first adjustment value and canceling bias through the second adjustment value. This segmentation enables simultaneous optimization of both error dispersion and average accuracy, resolving the contradiction between these two precision aspects.
Solution Approach 2:
The patent introduces two separate adjustment parameters instead of one, allowing independent optimization of dispersion and bias. The first adjustment value addresses dispersion while the second addresses bias, enabling high precision in both dimensions without trade-off.
3Ease of operation
If predicted implant position is adjusted using single adjustment constant, then refractive correction prediction is simplified, but prediction precision and reliability are compromised
Solution Approach 1:
The patent segments the adjustment constants into two distinct values that are applied in sequence: first to minimize dispersion and second to cancel bias. This segmented approach maintains computational simplicity while significantly improving prediction precision for refractive correction.
Solution Approach 2:
The patent changes from a single adjustment parameter to two parameters, enabling more precise predictions. The first parameter optimizes dispersion and the second optimizes bias, together achieving high precision without complicating the overall prediction process.
Data Source
AI summary
This process characterises a target system comprising a target implant and a target eye, said target system being characterised by an optical performance (CP) and a power (P) of said target implant. It comprises the following steps:obtaining (E10) an adjustment value of optical property (C1) intended to adjust at least one adjustable optical property (PA) of said target system (SC),obtaining (E20) an adjustment value of optical performance (C2) of said target system;determining (E30, E30′) a correspondence between said power (P) and the optical performance (CP) from at least one optical property (PO) of the target system including at least one adjustable property (PA), of said adjustment value of optical property (C1) and of said performance adjustment value (C2), the determining (E30) comprising the steps of:(i) adjustment (E30A) of a value of said adjustable property (PA) with said adjustment value of optical property (C1),(ii) adjustment (E30B) of a value of said optical performance (CP) or of said power (P) with said performance adjustment value (C2).