Gradient-Thickness AIOL Membrane for Clear Accommodation
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Solution Overview
Problem
Existing accommodating intraocular lenses (AIOLs) face challenges in maintaining optical quality and preventing stray light or glare due to varying refractive indices and unpredictable shape changes, which affect vision clarity.
Innovation Solution
The design of an accommodating intraocular lens with a dynamic membrane featuring a differential thickness gradient and a static anterior optical portion, where the dynamic membrane undergoes shape change for accommodation, while the static portion resists it, using a non-compressible optical fluid chamber to maintain optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the dynamic membrane is made thinner to improve flexibility and accommodation range, then the shape change capability is improved, but the optical quality deteriorates due to increased stray light and glare
Solution Approach 1:
The patent applies local quality by creating a differential thickness gradient across the dynamic membrane, where the thickness varies from the peripheral region to the central region. This allows different portions of the membrane to have different mechanical properties - the thinner peripheral regions provide greater flexibility for accommodation while the thicker central region maintains optical quality and reduces stray light, thus resolving the contradiction between accommodation range and optical quality.
Solution Approach 2:
The dynamic membrane is segmented into regions with different thickness characteristics - a peripheral region with lesser thickness for flexibility and a central region with greater thickness for optical quality. This segmentation allows each region to optimize its function independently, enabling the membrane to achieve both accommodation capability and optical performance.
2Object-affected harmful factors
If the dynamic membrane is made thicker to improve optical quality and reduce stray light, then the optical performance is improved, but the shape change capability for accommodation deteriorates
Solution Approach 1:
The patent resolves this contradiction by applying local quality through a differential thickness gradient, where the central region has greater thickness for optical quality and stray light reduction, while the peripheral region has lesser thickness for shape change capability. This localized differentiation allows both optical performance and accommodation to coexist.
Solution Approach 2:
The membrane is segmented into functional zones - a central zone with greater thickness for optical quality and a peripheral zone with lesser thickness for flexibility. This segmentation enables the thicker central region to block stray light while the thinner peripheral region accommodates shape changes for focal adjustment.
3Ease of manufacture
If a uniform thickness membrane is used to simplify manufacturing, then the manufacturing complexity is reduced, but the optical quality and accommodation performance deteriorate
Solution Approach 1:
The patent addresses this contradiction by implementing local quality through a controlled differential thickness gradient. The thickness is deliberately varied across the membrane - greater in the central region for optical quality and lesser in the peripheral region for flexibility. This graded thickness distribution optimizes both optical performance and accommodation capability while remaining manufacturable through controlled thin-film deposition techniques.
Solution Approach 2:
The patent applies parameter changes by varying the thickness parameter across different regions of the dynamic membrane. The thickness transitions from greater values in the central region to lesser values in the peripheral region. This parameter variation enables optimization of both optical quality and shape change capability, resolving the contradiction between manufacturing simplicity and performance.
4Adaptability or versatility
If the dynamic membrane undergoes significant shape change for accommodation, then the focal adjustment range is improved, but the optical quality deteriorates due to unpredictable shape changes
Solution Approach 1:
The patent resolves this contradiction by applying local quality through a differential thickness gradient. The peripheral region with lesser thickness undergoes greater shape change for focal adjustment, while the central region with greater thickness maintains more predictable and stable geometry for optimal optical quality. This localized differentiation ensures that shape changes are predictable and controlled, improving both focal adjustment range and optical quality.
Solution Approach 2:
The membrane is segmented into functional regions - a peripheral region that undergoes significant shape change for accommodation and a central region that maintains stable geometry. This segmentation ensures that shape changes are localized and predictable, preventing optical quality deterioration while maintaining focal adjustment capability.
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
The lens provides improved optical quality by controlling shape changes and reducing stray light, ensuring clear vision by harnessing ciliary tissue movements for precise focal adjustments.
Implementation Method 1
Compression of the fluid chamber at a first region causes the shape change of the central, dynamic zone for accommodation
Implementation Method 2
The dynamic membrane with a differential thickness gradient between a posterior surface and an anterior surface of the dynamic membrane
Data Source
AI summary
Intraocular lenses having an anterior optic with a central, dynamic zone configured to undergo shape change for accommodation that has a differential thickness gradient between a posterior surface and an anterior surface. Related devices and methods are provided.