Ophthalmological Laser Control Data via Zernike Offset Correction
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Solution Overview
Problem
Existing ophthalmological laser treatment methods for correcting corneal disorders fail to adequately account for non-coaxial components of the eye, leading to under-correction and higher order aberrations due to discrepancies between reference centers such as the pupil center and corneal vertex.
Innovation Solution
A method that adjusts Zernike polynomials based on an offset vector between different reference centers, such as the pupil center and corneal vertex, to generate improved control data for refractive laser treatment, considering higher order aberrations like astigmatism, defocus, and coma, and providing datasets for precise laser pulse positioning and beam guidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If correction profile is adjusted based on pupil center, then wavefront measurement accuracy is improved, but corneal vertex alignment deteriorates
Solution Approach 1:
The patent introduces an intermediary coordinate transformation system that bridges the pupil-centered wavefront measurement coordinate system and the corneal-vertex-centered treatment coordinate system. By calculating and applying transformation matrices based on the offset vector between these two reference centers, the system enables accurate mapping of correction profiles between different coordinate systems, thus resolving the contradiction between measurement accuracy and alignment precision
Solution Approach 2:
The patent transforms the correction profile parameters from one coordinate system to another by changing the reference center parameters. Specifically, it uses Zernike polynomial transformations with adjusted reference centers to convert wavefront error data obtained at the pupil center into treatment parameters referenced to the corneal vertex, thereby maintaining both measurement accuracy and treatment alignment
2Manufacturing precision
If correction profile is adjusted based on corneal vertex, then corneal alignment is improved, but wavefront measurement accuracy deteriorates
Solution Approach 1:
The transformation matrix serves as an intermediary that translates between the two coordinate systems. It allows the system to maintain measurement data in the pupil-centered system while generating treatment profiles in the corneal-vertex-centered system, thus preserving both measurement accuracy and treatment alignment simultaneously
3Ease of operation
If Zernike polynomials are not corrected for offset, then calculation simplicity is maintained, but treatment precision deteriorates
Solution Approach 1:
The patent performs preliminary correction of the Zernike polynomials by pre-calculating the coordinate transformation based on the offset vector between reference centers. This preliminary action transforms the wavefront error data into the correct coordinate system before treatment planning, ensuring treatment precision without complicating the subsequent treatment execution steps
Data Source
AI summary
A method for providing control data for an ophthalmological laser of a treatment apparatus is disclosed. The method provides the steps of: ascertaining visual disorder correction data for correcting a cornea of an eye; determining Zernike polynomials from the ascertained visual disorder correction data; ascertaining an offset vector from a pupil center to a further preset reference center of the eye; calculating corrected Zernike polynomials, in which higher order aberrations are calculated by means of an adaptation of the corresponding Zernike polynomials by the offset vector; and providing the control data for the treatment apparatus, wherein the control data is generated by means of the corrected Zernike polynomials.