Dual-Lens Intraocular Lens with Accommodation Material
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Solution Overview
Problem
Current intraocular lens systems fail to provide true accommodation, as they rely on directional focus and do not effectively mimic the natural lens's ability to change curvature for near and far vision, often leading to complications such as posterior capsular opacification and vascular iris damage.
Innovation Solution
A dual-lens system is implanted within the capsular bag, with one lens placed anteriorly to seal the capsular opening and provide refractive power, and another lens placed posteriorly with a squared edge to prevent opacification, using an accommodation material with a refractive index similar to the aqueous humor that expands and contracts with zonular action, allowing for adjustable focus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single intraocular lens is implanted to replace the natural lens, then clear vision is restored, but the ability to accommodate for near and far objects is lost
Solution Approach 1:
The patent divides the lens system into two separate lenses: a primary intraocular lens for distance vision and a secondary accommodative lens that can change shape. This segmentation allows each lens to perform its specialized function while working together to restore both clear vision and accommodation capability.
Solution Approach 2:
The patent introduces a dynamic element through the accommodative lens that can change its curvature and optical power in response to ciliary muscle contraction. This dynamic capability enables the lens system to adapt between near and far focus, restoring the natural accommodation function.
2Adaptability or versatility
If bi or multi-focal lenses are used to provide focal length accommodation, then vision over a continuous range of distance is achieved, but the accommodation is dependent upon direction of focus and does not provide true accommodation
Solution Approach 1:
The patent employs a dynamically adjustable lens system where the accommodative lens changes shape through physiological muscle action rather than relying on fixed multi-focal zones. This dynamic mechanism provides true accommodation by actively changing optical power in response to focus demands, unlike static bi-focal designs.
Solution Approach 2:
The lens system utilizes the eye's own ciliary muscle and zonular apparatus to drive accommodation, eliminating the need for external control mechanisms or complex optical designs. The natural physiological structures self-regulate the lens shape change, providing authentic accommodation.
3Power
If the accommodation material has a refractive index different from aqueous humor, then optical power can be adjusted, but interference with lens function may occur
Solution Approach 1:
The patent carefully selects and optimizes the refractive index parameter of the accommodation material to match that of aqueous humor. This parameter matching eliminates optical interference and refraction artifacts while still allowing the material to provide the necessary optical power through its adjustable curvature.
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 dual-lens system provides continuous range vision correction by altering the eye's optical power and prevents posterior capsular opacification, offering improved accommodation and reduced surgical risks.
Implementation Method 1
The accommodation material has a refractive index similar to that of the aqueous humor thereby reducing any potential interference with the lenses
Implementation Method 2
The accommodation material has a refractive index similar to that of the aqueous humor thereby reducing any potential interference with the lenses
Data Source
AI summary
The invention relates to a multi-lens intraocular lens system having an accommodation material between the lenses. The system comprises an posterior lens attached to the posterior surface of the capsular bag and an anterior lens attached to the anterior surface of the capsular bag. The anterior and posterior lenses have different optical properties providing different degrees and types of correction. An accommodation material is place between the anterior and posterior lenses. The accommodation material may comprise of one or more macromers, which, when polymerized, adjust the properties of the accommodation material.