Eye Surgical Laser Control for Corneal Lenticule Deformation
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Solution Overview
Problem
Existing eye surgical lasers for separating a lenticule in the cornea face challenges due to deformation caused by rigid contact elements, leading to imperfect treatments and the need for complex and expensive simulations to compensate for this deformation.
Innovation Solution
A method and control device that determine a lenticule geometry and deformation geometry based on visual disorder data, using correction values derived from measurements to generate control data for the laser, allowing for simple compensation of deformation 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 remains stable and not moved, but the cornea deforms and the lenticule shape changes leading to defective treatment
Solution Approach 1:
The patent applies preliminary action by performing measurements of the corneal curvature and lenticule geometry before the actual laser treatment. The control device stores these pre-treatment measurements and uses them to calculate corrected treatment parameters that compensate for the expected deformation caused by the contact element. This allows the system to anticipate and counteract the deformation effect before it occurs during treatment.
Solution Approach 2:
The patent implements feedback by measuring the actual corneal curvature and lenticule geometry before treatment, using these measurements to calculate correction values, and then adjusting the treatment parameters based on these correction values. The control device continuously references the pre-treatment measurements to ensure accurate lenticule separation despite the deforming contact element.
2Manufacturing precision
If simulations or geometric variation on coordinate system are performed to compensate for corneal deformation, then treatment accuracy is improved, but the process becomes very complex and expensive
Solution Approach 1:
The patent applies parameter changes by calculating correction values based on measured corneal curvature and lenticule geometry parameters. The control device adjusts the treatment parameters (such as laser pulse positioning and energy distribution) using these correction values, which are derived from simple geometric measurements rather than complex simulations. This approach modifies the treatment parameters directly based on measurable quantities, avoiding the need for complex computational simulations.
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
Enables better treatment results by compensating for deformation without requiring complex simulations, improving treatment accuracy and reducing costs.
Implementation Method 1
a pulsed laser and a beam focusing device can for example be formed such that laser beam pulses effect a photodisruption in a focus located within the organic material to separate a lenticule from the cornea
Data Source
AI summary
A method for providing control data for an eye surgical laser is disclosed. A control device ascertains a lenticule geometry of a lenticule to be separated from predetermined visual disorder data of a human or animal eye. The control device ascertains a correction value for compensating for a deformation of the lenticule, which is generated by at least one contact element of the treatment apparatus. The control device ascertains a deformation geometry of the lenticule, wherein a deformation refractive power value is calculated depending on the refractive power value to be corrected and the correction value. A deformation diameter is calculated depending on a lenticule diameter and the correction value. The control device provides control data for controlling the eye surgical laser, which uses the deformation geometry for the separation of the lenticule.