Marked Intraocular Lens Angular Alignment
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Solution Overview
Problem
Current intraocular lenses, particularly toric lenses, face challenges in accurately aligning with the astigmatic axis of the cornea, leading to residual astigmatism due to rotational misalignment, which degrades vision and is difficult to correct once implanted.
Innovation Solution
Incorporating non-continuous marks with distinct features, such as circular holes or dots, on the intraocular lens to aid in angular alignment, with specific geometries and placements that enhance visibility under surgical conditions, allowing for precise alignment of the low power meridian with the astigmatic axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If toric intraocular lenses are used to correct astigmatism, then vision correction is improved, but alignment accuracy deteriorates due to rotational misalignment
Solution Approach 1:
The patent applies visual marking principles by creating high-contrast markings on the intraocular lens that allow surgeons to easily identify and align the low power meridian with the astigmatic axis. The markings provide visual cues that enable precise angular alignment during surgery, directly addressing the alignment accuracy problem while maintaining the vision correction benefits of toric lenses.
2Reliability
If intraocular lenses are implanted, then vision correction is achieved, but alignment adjustment becomes difficult
Solution Approach 1:
The patent incorporates alignment markings on the intraocular lens before implantation. These pre-established visual guides enable surgeons to achieve correct angular alignment during the initial surgery, eliminating the need for difficult post-implantation adjustments. The markings are permanently integrated into the lens design, ensuring that alignment can be properly established during the surgical procedure itself.
3Measurement precision
If rotational misalignment occurs, then residual astigmatism increases, but visibility of alignment features is reduced
Solution Approach 1:
The patent creates high-visibility markings on the intraocular lens using contrast enhancement techniques. The markings are designed to be clearly visible under surgical lighting conditions, enabling surgeons to accurately identify the low power meridian and align it with the astigmatic axis. The enhanced visibility directly addresses the issue of detecting and preventing rotational misalignment during surgery.
Data Source
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AI summary
An intraocular lens for providing vision to an animal or human subject has anterior and posterior sides. The lens includes an optic body, one or more haptics, and one or more marks. Each mark has four or more features (43) disposed along an imaginary line when viewed from the anterior side and/or the posterior side. The mark(s) may be used as an aid in angularly aligning the lens during use.