Accommodating Intraocular Lens Optics With Two-Channel Astigmatism Control
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Solution Overview
Problem
Existing accommodating intraocular lenses face challenges in maintaining optical quality throughout accommodation and disaccommodation, often leading to issues like astigmatism due to inadequate design of fluid channels.
Innovation Solution
The intraocular lens design features an aspheric optic with anterior and posterior elements that maintain thickness profiles and channel configurations to ensure consistent optical quality, utilizing two-channel buttress designs in the posterior element to reduce astigmatism and enhance deformation predictability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional spherical optic design is used in accommodating intraocular lenses, then manufacturing is simpler, but optical quality deteriorates during accommodation and disaccommodation due to astigmatism
Solution Approach 1:
The patent applies aspheric curvature to the optic surfaces, replacing traditional spherical design. The aspheric surfaces are defined by specific mathematical equations (e.g., z = c*r^2/(1+sqrt(1-(1+k)*c^2*r^2)) + alpha*r^4) that create non-spherical curvature profiles. This allows the lens to maintain consistent optical quality throughout accommodation by compensating for spherical aberration and reducing astigmatism induced by lens deformation, while still being manufacturable through precision molding techniques.
2Device complexity
If single-channel fluid communication is used, then device complexity is reduced, but deformation predictability and optical quality deteriorate
Solution Approach 1:
The patent divides the fluid communication system into multiple independent channels (at least two fluid channels) that separately connect the optic fluid chamber to the peripheral portion. Each channel can be independently configured with specific dimensions, positions, and geometries. This segmentation allows precise control over fluid flow patterns and lens deformation characteristics, enabling predictable accommodation while maintaining manageable device complexity through modular channel design.
Solution Approach 2:
The patent implements different channel configurations in different regions of the lens. The fluid channels have varying cross-sectional areas, lengths, and positions tailored to specific functional requirements. For example, channels may be positioned to optimize fluid flow during specific phases of accommodation, or sized to control deformation rates in different optic regions. This local optimization of channel properties enhances overall deformation predictability without requiring complete redesign of the entire fluid system.
3Ease of operation
If optic is not centered with peripheral portion, then insertion and positioning may be easier, but optical quality and stability deteriorate
Solution Approach 1:
The patent employs asymmetric design features in the peripheral portion, such as asymmetric haptic configurations or asymmetric connection structures between the optic and peripheral portions. These asymmetric elements serve as mechanical guides that automatically align the optic with the peripheral portion during insertion, ensuring proper centering without requiring complex positioning mechanisms. The asymmetric features create natural alignment cues that simplify the insertion process while guaranteeing stable optical alignment once positioned.
Data Source
AI summary
Accommodating intraocular lenses including an optic having an anterior element and a posterior element defining an optic fluid chamber, wherein the optic is aspheric across all powers throughout accommodation or disaccommodation. Intraocular lenses, optionally accommodating, where an optic portion is centered with a midline of a height of the peripheral portion, the height measured in the anterior to posterior direction.