Ophthalmological Laser Aberration Correction via Wavefront Segmentation
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Solution Overview
Problem
Existing ophthalmological laser treatment methods fail to accurately account for higher order optical aberrations during corneal corrections, as these aberrations cannot be captured by subjective refractive power measurements, leading to incomplete vision correction.
Innovation Solution
The method involves analyzing wavefront measurements for two different extensions to determine refractive power errors, calculating the effect of higher order aberrations, and modifying the refractive power correction to account for these aberrations, using a control device to provide aberration-corrected control data for the laser.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wavefront measurements are performed to determine optical aberrations, then measurement precision of optical aberrations is improved, but device complexity increases due to combining refractive power change with aberration values from different reference centers
Solution Approach 1:
The wavefront measurement is segmented into two different extensions: a first extension for determining first aberration values and a second (smaller) extension for determining second aberration values. This segmentation allows the system to analyze aberrations at multiple scales, thereby capturing higher order aberrations that would be missed in a single measurement, while maintaining a manageable computational framework for combining results with refractive power data.
Solution Approach 2:
The invention adds a dimensional aspect to wavefront analysis by measuring aberrations at two different extension sizes rather than a single fixed size. This dimensional variation in measurement scope enables the system to differentiate between lower order and higher order aberrations, transforming a two-dimensional measurement problem into a three-dimensional analysis that includes the dimension of measurement scope/extension size.
2Ease of operation
If subjective refractive power correction is used for treatment planning, then ease of operation is improved, but manufacturing precision of vision correction deteriorates due to inability to capture higher order aberrations
Solution Approach 1:
The system performs preliminary wavefront measurements to determine both first and second aberration values before final treatment planning. By calculating the difference between aberration values from two different extensions in advance, the system prepares corrected refractive power data that accounts for higher order aberrations, thereby improving the precision of subsequent laser treatment without complicating the actual treatment execution process.
Solution Approach 2:
The invention introduces an intermediary computational step that calculates the difference between first aberration values (from larger extension) and second aberration values (from smaller extension). This intermediary calculation serves as a mediator that translates complex wavefront data into corrected refractive power values, which can then be seamlessly integrated with subjective refraction results, maintaining ease of operation while improving correction precision.
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 allows for improved control data that reduces or avoids optical aberrations, enabling more precise visual disorder corrections by compensating for higher order aberrations not accounted for in traditional methods.
Implementation Method 1
ascertaining first aberration values from a predetermined wavefront measurement of an eye, wherein the wavefront measurement has a first extension
Implementation Method 2
laser pulses effect a photodisruption and/or photoablation in a focus situated within the organic tissue, to remove a tissue, in particular a tissue lenticule, from the cornea
Implementation Method 3
laser pulses effect a photodisruption and/or photoablation in a focus situated within the organic tissue
Data Source
AI summary
The invention relates to a method for providing control data for an ophthalmological laser (12) of a treatment apparatus (10) for avoiding optical aberrations. As the steps, the method includes ascertaining (S10) first aberration values from a predetermined wavefront measurement of an eye, which has a first extension (32), wherein a first refractive power error is determined from the first aberration values; ascertaining (S12) second aberration values from a subset of the predetermined wavefront measurement, which has a second extension (34), wherein the second extension (34) is smaller than the first extension (32), wherein a second refractive power error is determined from the second aberration values; ascertaining (S14) a difference between the first and the second refractive power error; ascertaining (S16) an aberration-corrected refractive power change by subtracting the ascertained difference of refractive power errors from a predetermined subjective refractive power correction, which is predetermined from a glasses correction measurement; and providing (S18) the control data for the ophthalmological laser (12), which includes the aberration-corrected refractive power change.