Accommodating Intraocular Lens with Translating Haptics
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Solution Overview
Problem
Current intraocular lenses (IOLs) fail to adequately accommodate for near focus, leading to visual aberrations and reduced visual quality, as they do not effectively increase dioptric power in response to ciliary muscle contraction, similar to a youthful natural lens.
Innovation Solution
The development of an intraocular lens with a deformable optic and haptic system that includes a sleeve and translating arm, which increases dioptric power by reducing the equatorial diameter of the optic when the ciliary muscle contracts, allowing for accommodation without inducing irregular astigmatism or optical aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pseudo-accommodating lenses or accommodating lenses are used to provide near focus, then accommodation capability is improved, but optical aberrations such as glare, halos, and reduced contrast sensitivity occur
Solution Approach 1:
The patent employs a dynamic haptic system with translating arms and sleeves that enable the optic to change its equatorial diameter in response to ciliary muscle contraction. This dynamic mechanism allows the lens to transition between accommodated and unaccommodated states, achieving near and distance focus respectively, without relying on static multi-focus or diffraction optics that cause aberrations.
Solution Approach 2:
The invention changes the physical parameter of the optic's equatorial diameter through haptic translation. When the ciliary muscle contracts, the haptics translate medially, reducing the equatorial diameter and increasing the curvature of the optic, thereby increasing dioptric power for near focus. This parameter change approach avoids the optical aberrations associated with multi-focus or diffractive designs.
2Adaptability or versatility
If silicone elastomeric hinged lenses are used to achieve forward movement of the optic, then near focus capability is improved, but effective accommodation diminishes over time due to fibrosis and stiffening of the lens capsule
Solution Approach 1:
The patent employs a dynamic haptic system with translating arms and sleeves that enable the optic to change its equatorial diameter in response to ciliary muscle contraction. This dynamic mechanism allows the lens to transition between accommodated and unaccommodated states, achieving near and distance focus respectively, without relying on static multi-focus or diffraction optics that cause aberrations.
Solution Approach 2:
The invention replaces the elastomeric hinge mechanism with a haptic-based mechanical system that uses translation along the optical axis to achieve accommodation. The haptics connect to the optic and translate in response to ciliary muscle contraction, providing a more reliable long-term solution that does not depend on the elastomeric properties of the hinge material.
3Adaptability or versatility
If the equatorial diameter of the optic is reduced to increase dioptric power, then near focus capability is improved, but irregular astigmatism and optical aberrations may be induced
Solution Approach 1:
The patent employs a dynamic haptic system with translating arms and sleeves that enable the optic to change its equatorial diameter in response to ciliary muscle contraction. This dynamic mechanism allows the lens to transition between accommodated and unaccommodated states, achieving near and distance focus respectively, without relying on static multi-focus or diffraction optics that cause aberrations.
Solution Approach 2:
The invention applies local quality changes by selectively modifying the curvature of specific regions of the optic. The haptic translation mechanism causes the optic to become more curved in the central optical zones needed for focus, while maintaining regular astigmatism control through the centration lips that keep the optic properly positioned in the capsular bag.
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 design enables the IOL to achieve a range of focus similar to a youthful natural lens, improving near vision without causing significant optical issues, thereby enhancing visual clarity and reducing the need for corrective eyewear.
Implementation Method 1
increases dioptric power by reducing the equatorial diameter of the optic when the ciliary muscle contracts
Data Source
AI summary
An accommodating intraocular lens (IOL) is provided. The IOL includes an optic having an anterior face and a posterior face. One or more centration lips are disposed directly on the posterior and/or anterior face of the optic or directly on the posterior and/or anterior face of a carrier that holds the optic. Anterior centration lips are configured to center the optic in a lens capsulotomy opening. Posterior centration lips are configured to fixate the optic in a lens capsule and also center the optic in a lens capsulotomy opening.