Ophthalmological Laser Coordinate Adaptation via Deformation Matrix
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Solution Overview
Problem
Existing ophthalmological laser treatment apparatuses face challenges in accurately determining treatment coordinates due to deformation caused by contact elements, leading to erroneous geometry changes in the cornea and compromised treatment results.
Innovation Solution
A method that involves acquiring pre-fixation and post-fixation images of the eye to determine orientation points, calculating a transformation matrix describing the deformation, and adapting treatment coordinates using this matrix to compensate for the deformation, ensuring accurate laser positioning for correcting visual disorders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a contact element is used to fix the eye during treatment, then the eye is stabilized in a fixed position, but the shape and geometry of the cornea changes leading to erroneous treatment coordinates
Solution Approach 1:
The patent acquires a first image of the eye before contact element fixation to establish treatment coordinates in the non-deformed state. This preliminary measurement allows the system to later compensate for deformation by comparing with a post-fixation image, thereby maintaining treatment coordinate accuracy while still using contact elements for stabilization.
Solution Approach 2:
The patent implements a feedback mechanism by acquiring a second image after contact element fixation, determining orientation points in both images, and calculating a transformation matrix based on the positional changes of these points. This feedback loop enables real-time compensation for corneal deformation, ensuring accurate treatment coordinates are maintained despite the stabilizing effect of contact elements.
2Measurement precision
If treatment coordinates are determined before eye fixation, then the coordinates reflect the natural corneal geometry, but the coordinates become erroneous after the contact element deforms the cornea
Solution Approach 1:
The system determines treatment coordinates from a first image taken before contact element application, then acquires a second image after fixation and calculates a transformation matrix based on orientation point displacement. This feedback mechanism transforms the initially determined coordinates to compensate for deformation, maintaining both measurement precision and treatment reliability.
Solution Approach 2:
The patent changes the coordinate system parameters by applying a transformation matrix that maps coordinates from the non-deformed state to the deformed state. This parameter transformation allows the treatment coordinates to accurately reflect the actual corneal geometry during treatment, ensuring reliable treatment results despite the deformation caused by contact elements.
Data Source
AI summary
A method is disclosed for adapting treatment coordinates for a treatment of an eye with an ophthalmological laser of a treatment apparatus. The treatment apparatus includes a contact element for fixing the eye. The method includes acquiring at least a first image of the eye, before the eye is fixed by the contact element, and determining treatment coordinates of the eye by means of the first image, determining orientation points of the eye and the position thereof in the first image; acquiring a second image of the eye, after the eye has been fixed by the contact element, wherein the position of the respective orientation points is determined in the second image. The method also includes determining a transformation matrix based on the respectively determined positions of related orientation points in the first and the second image, and adapting (S18) the treatment coordinates by the determined transformation matrix.