Ophthalmological Laser Nomogram Adaptation for Refraction Precision
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Solution Overview
Problem
Existing ophthalmological laser treatment apparatuses often experience deviations between planned and achieved refraction corrections due to characteristics of the treatment apparatus and environmental conditions.
Innovation Solution
A method utilizing a nomogram to adapt initial correction data for sphere, cylinder, and axis values, ensuring that the achieved refraction correction aligns with the planned correction by compensating for the specific properties of the treatment apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If standard refraction correction is applied without apparatus-specific adaptation, then the treatment process is simple and fast, but the achieved correction deviates from the planned correction due to apparatus characteristics
Solution Approach 1:
The nomogram is pre-calculated and stored in the control device before treatment. It contains pre-determined adaptation values for sphere, cylinder, and axis based on previous treatment results with the same apparatus. This preliminary preparation eliminates the need for real-time complex calculations during treatment, resolving the contradiction between precision and complexity.
Solution Approach 2:
The nomogram acts as an intermediary element between the planned correction data and the actual treatment parameters. It mediates the discrepancy caused by apparatus characteristics by providing pre-computed adaptation factors that transform planned values into accurate control data, achieving precision without requiring complex real-time adjustments.
2Reliability
If apparatus-specific adaptation is performed using nomogram, then the refraction correction precision is improved, but the treatment planning and control data generation becomes more complex
Solution Approach 1:
All complex adaptation calculations are performed in advance during treatment planning using stored nomogram data. The control device retrieves pre-computed adaptation values for sphere, cylinder, and axis corrections, eliminating the need for complex real-time calculations and reducing operational complexity while maintaining high reliability.
Solution Approach 2:
The control device automatically retrieves and applies the appropriate nomogram based on the treatment apparatus identification. The system self-adapts to apparatus characteristics without requiring manual intervention or complex real-time processing, thereby improving reliability while keeping the operational complexity low.
3Measurement precision
If correction data is adapted using nomogram based on preceding treatment results, then the accuracy of refraction correction is improved, but the time required for treatment planning increases
Solution Approach 1:
The nomogram is pre-calculated and stored during apparatus characterization or from pre-existing treatment databases. During treatment planning, the control device simply retrieves the appropriate nomogram and applies pre-computed adaptation values, avoiding time-consuming real-time calculations while maintaining high accuracy in correction data.
Solution Approach 2:
Instead of performing complex real-time calculations, the system uses copied pre-computed nomogram data that encapsulates the temporal and spatial characteristics of the apparatus from previous treatments. This copying approach provides accurate correction data without the time cost of recalculating apparatus characteristics for each treatment case.
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
The method enables improved refraction corrections by accurately accounting for the treatment apparatus's characteristics, thereby enhancing the precision and reliability of ophthalmological laser treatments.
Implementation Method 1
pulsed lasers and a beam focusing device can for example be formed such that laser pulses effect a photodisruption and/or ablation in a focus area situated within the organic tissue to remove a tissue
Implementation Method 2
pulsed lasers and a beam focusing device can for example be formed such that laser pulses effect a photodisruption and/or ablation in a focus area situated within the organic tissue to remove a tissue
Data Source
AI summary
The invention relates to apparatuses and methods for providing control data for an ophthalmological laser (12) of a treatment apparatus (10). The method includes ascertaining (S10) correction data for a planned refraction correction of a visual disorder of a cornea (16) from predetermined examination data, wherein the correction data includes a correction for a sphere value, a cylinder value and an axis value; determining (S12) adapted correction data based on a nomogram and the ascertained correction data, wherein the correction of the sphere value and/or the cylinder value and/or the axis value is adapted to the used treatment apparatus (10) by the nomogram, such that a refraction correction with the adapted correction data corresponds to the planned refraction correction, wherein the nomogram is ascertained by preceding treatment results with identical treatment apparatuses; and providing (S14) the control data, which is based on the adapted correction data.