Deformation-Corrected Laser Control for Corneal Treatment
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Solution Overview
Problem
Current methods for correcting corneal visual disorders using lasers face challenges due to corneal deformation caused by contact elements, leading to unpredictable treatment outcomes and complex compensation processes.
Innovation Solution
A method to provide deformation-corrected control data for lasers, using a mathematical model based on the Euler-Bernoulli beam theory to adapt lenticule diameter and refractive power change correction parameters, ensuring accurate compensation for corneal deformations induced by contact elements or closure effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a rigid contact element is used to fix the eye during treatment, then the eye stability is improved, but the cornea shape is deformed and compression occurs
Solution Approach 1:
The patent applies preliminary anti-action by calculating deformation compensation values before treatment and adjusting the lenticule diameter and refractive power change parameters in advance to counteract the expected corneal compression from the contact element, thereby preventing the harmful deformation effect while maintaining eye stability
2Manufacturing precision
If deformation compensation is calculated to correct corneal deformation, then the treatment accuracy is improved, but the calculation complexity and time consumption increase
Solution Approach 1:
The patent applies preliminary action by pre-calculating deformation compensation values based on predetermined deformation data and mathematical models before the actual treatment, storing these compensation parameters for direct use during treatment, which simplifies the treatment process while maintaining high accuracy
Solution Approach 2:
The patent applies parameter changes by transforming the complex deformation compensation problem into calculations involving specific parameters (lenticule diameter ratio, refractive power change ratio) that can be computed using established mathematical relationships, thereby reducing calculation complexity while maintaining treatment precision
3Manufacturing precision
If the lenticule diameter is deformation-corrected, then the refractive power change parameter changes non-proportionally, making the adaptation difficult to determine
Solution Approach 1:
The patent applies feedback by establishing mathematical relationships where the refractive power change parameter is adjusted based on the deformation-corrected lenticule diameter parameter, using predetermined deformation data to create a feedback loop that automatically determines the appropriate parameter adaptations
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 deformation correction, improving treatment accuracy by directly compensating for deformation effects between lenticule diameter and refractive power change, thereby enhancing the reliability of corneal correction procedures.
Implementation Method 1
laser beam pulses effect an optical breakthrough in a focus situated within the tissue of the cornea to separate a lenticule from the cornea
Data Source
AI summary
The invention relates to a method for providing deformation-corrected control data for a laser (18) of a treatment apparatus (10). The method includes as steps determining (S10) a planned lenticule diameter and a planned refractive power change as correction parameters for correcting a visual disorder of the eye from predetermined examination data; determining deformation-corrected correction parameters for adapting the planned correction parameters, by which a deformation of the cornea (26) is additionally compensated for; wherein either a deformation-corrected lenticule diameter or a deformation-corrected refractive power change is determined from predetermined deformation data as the first deformation-corrected correction parameter (S12) and the respectively other correction parameter is determined as the second deformation-corrected correction parameter by means of the determined first deformation-corrected correction parameter and depending on a mathematical deformation model (S14); and providing the control data for the treatment apparatus (10), which includes the determined deformation-corrected correction parameters.