Ophthalmological Laser Device Optical Zone Coverage
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Solution Overview
Problem
Current ophthalmological laser treatment devices face challenges in ensuring accurate positioning of surgical structures within the eye, leading to sub-optimal vision correction, especially in low light environments, due to inadequate assessment of the overlap between the optical zone and the refractive correction structure.
Innovation Solution
An evaluation unit determines the degree of instantaneous overlap between the optical zone and the refractive correction structure using recorded images, allowing for adjustments in irradiation control data and positioning to ensure complete coverage of the optical zone, which can be manually or automatically corrected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the surgical structure is positioned based on standard positioning methods, then the treatment can be completed with standard procedures, but the coverage of the optical zone may be insufficient especially in low light environments
Solution Approach 1:
The system implements feedback by continuously monitoring the pupil's position and size through imaging, calculating the overlap between the surgical structure and optical zone, and using this information to adjust the surgical structure positioning to ensure complete coverage of the optical zone
Solution Approach 2:
The system performs preliminary assessment of the overlap between the surgical structure and optical zone before finalizing the treatment plan, allowing for adjustments to be made in advance to ensure proper coverage under varying lighting conditions
2Reliability
If the surgical structure is enlarged to ensure complete coverage of the optical zone, then vision correction quality improves, but the treatment time increases
Solution Approach 1:
The system dynamically adjusts the surgical structure parameters based on real-time pupil measurements and overlap calculations, optimizing the structure size to achieve complete optical zone coverage while minimizing treatment time through automated adjustments
3Measurement precision
If manual adjustment of the surgical structure is performed to ensure complete optical zone coverage, then treatment accuracy improves, but the complexity of the procedure increases
Solution Approach 1:
The system performs self-adjustment by automatically calculating the required surgical structure modifications based on pupil measurements and overlap assessments, eliminating the need for manual intervention while maintaining high positioning accuracy
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 improves the accuracy and effectiveness of refractive treatments by ensuring complete coverage of the optical zone, reducing the likelihood of impaired vision and shortening treatment duration, even in low light conditions.
Implementation Method 1
A corresponding femtosecond laser system is described in WO 2008/064771 A1. Here, the ablation of stromal tissue required for a refractive correction is separated by a double laser incision to prepare a lenticule.
Implementation Method 2
deep incisions are made in stromal tissue with a femtosecond laser to create a contiguous cavity, specifically a cylindrical shape, without ablating tissue. As the cavity collapses, the reduction in tissue strength and intraocular pressure causes the cornea to relax and assume a new shape
Implementation Method 3
the ablation of stromal tissue required for a refractive correction is separated by a double laser incision
Implementation Method 4
a detection device for recording an image of at least part of the eye
Implementation Method 5
a light source for illuminating at least the part of the eye
Data Source
Figure 1A~1B
Figure 2
Figure 3A~3B
AI summary
A surgical structure to be introduced into the eye by means of an excimer or femtosecond laser must be positioned exactly in the co-ordinate system of the laser. By recording monitoring images and comparing the actual position and the desired position of the pupil it is possible to detect a movement of the structure and/or the patient in order to compensate for deviations. Nevertheless a suboptimal treatment can take place, after which vision is not optimal, in particular in dark environments. The invention is intended to enable improved vision after laser treatments. For this purpose an evaluation unit is provided, which is designed to detect a degree of current overlap of an optical zone of the eye and the structure or at least a refractively correcting part of the structure with the aid of a recorded image. By the detection of the degree of overlap between the current optical zone and the structure to be introduced it is possible to control the coverage of the optical zone by the tissue volume specifically altered by means of laser processing and thus to enable maximum coverage.