Toric IOL With Depth of Focus Extender
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Solution Overview
Problem
Current toric intraocular lenses (IOLs) are sensitive to alignment errors and cylinder power selection, leading to residual astigmatism and other aberrations due to misalignment and measurement inaccuracies during surgery.
Innovation Solution
A toric IOL with a depth of focus extender is used to reduce sensitivity to rotation and cylinder power errors, incorporating a depth of focus extender that increases alignment tolerance and matching to astigmatic corrections, thereby improving vision correction accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a toric IOL is used to correct astigmatism, then vision correction is improved, but sensitivity to alignment errors and cylinder power selection increases
Solution Approach 1:
The patent applies parameter changes by modifying the optical parameters of the IOL system. Specifically, it combines a toric IOL with a depth of focus extender that has specific optical powers and cylindrical components. By adjusting the parameters of the depth of focus extender (such as its optical power, cylindrical power, and positioning relative to the toric IOL), the system achieves reduced sensitivity to alignment errors while maintaining effective astigmatism correction. This allows the overall system to tolerate greater misalignment without compromising vision correction accuracy.
2Reliability
If a toric IOL is used to correct astigmatism, then vision correction is improved, but dependence on precise surgical skills increases
Solution Approach 1:
The patent implements beforehand cushioning by designing a system where the depth of focus extender compensates for potential alignment errors before they occur. The extender is positioned and configured in advance to create an optical system that is inherently more tolerant of surgical misalignment. This pre-compensation approach reduces the skill level required during surgery, as the system itself provides a buffer against common surgical errors in toric IOL alignment.
3Reliability
If a toric IOL is used to correct astigmatism, then vision correction is improved, but residual astigmatism and aberrations increase due to misalignment
Solution Approach 1:
The patent introduces a depth of focus extender as an intermediary element between the toric IOL and the retina. This intermediary component serves to mitigate the harmful effects of misalignment by modifying the optical path in a way that reduces residual astigmatism. The depth of focus extender acts as a mediator that compensates for the misalignment-induced aberrations, thereby reducing the overall residual astigmatism while maintaining the astigmatism correction benefits of the toric IOL.
Data Source
AI summary
A method, system and apparatus for vision correction are disclosed. The method, system and apparatus include a toric intraocular element for correcting astigmatism and having a cylinder power, and a depth of focus extender coupled to the toric intraocular element, the depth of focus extender extending a depth of focus. The extended depth of focus may reduce sensitivity of the toric intraocular element to at least one of rotation and selected cylinder power.