Dual-Optic Intraocular Lens for Near-Vision Accommodation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional intraocular lenses often fail to provide adequate accommodation for patients, particularly in correcting near vision after cataract surgery, limiting their ability to focus on both far and near distances.
Innovation Solution
The development of accommodating intraocular lenses with a dual-optic lens system, comprising a posterior intraocular lens and a more rigid anterior intraocular lens that separates from the posterior lens during accommodative reflex, increasing dioptric power and depth of focus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single intraocular lens is used, then the device complexity is low, but the accommodation ability and near vision correction are insufficient
Solution Approach 1:
The patent divides the intraocular lens system into two separate lenses: a posterior intraocular lens and an anterior intraocular lens. The anterior lens is positioned in the capsular bag while the posterior lens is implanted in the ciliary sulcus. This segmentation allows each lens to perform specific optical functions, with the anterior lens providing accommodation through shape change and the posterior lens providing stable optical power, thereby resolving the contradiction between accommodation ability and device complexity.
Solution Approach 2:
The anterior intraocular lens is nested within the capsular bag structure, while the posterior intraocular lens is positioned in the ciliary sulcus behind the iris. The two lenses are arranged in a nested configuration where the anterior lens is anterior to the posterior lens, creating a compact dual-lens system that maximizes accommodation ability while minimizing overall device complexity.
2Adaptability or versatility
If the anterior intraocular lens is made flexible to enable shape change during accommodation, then the accommodation range increases, but the structural stability and positioning precision decrease
Solution Approach 1:
The anterior intraocular lens is designed with non-uniform local properties: the central optical zone is made flexible to allow shape change during accommodation, while the peripheral haptic regions are made more rigid to maintain stable positioning within the capsular bag. This local quality differentiation resolves the contradiction by providing both shape change capability in the optical zone and positioning stability in the support structures.
Solution Approach 2:
The anterior intraocular lens combines flexible optical material with rigid haptic structures into a single integrated component. The flexible central portion enables accommodation through shape change, while the rigid peripheral haptics provide stable anchoring in the capsular bag, thus merging the conflicting requirements of flexibility and stability into one unified lens design.
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
Enhances the patient's ability to focus at both closer and farther distances by increasing optical power during accommodative reflex, improving near vision acuity beyond what single-vision lenses can achieve.
Implementation Method 1
The anterior intraocular lens is more flexible or elastic than the posterior intraocular lens
Implementation Method 2
The first and second optical lenses may collectively provide a desired amount of dioptric power of the accommodating intraocular lens system
Data Source
AI summary
An accommodating intraocular lens system includes a posterior intraocular lens having a first optical lens and first haptics. The accommodating intraocular lens system also includes an anterior intraocular lens having a second optical lens and second haptics, where the second haptics are attached to the posterior intraocular lens. The posterior intraocular lens is configured to remain in a substantially fixed position within an eye in an absence of accommodative reflex. The anterior intraocular lens is configured to at least one of change shape or change position during accommodative reflex in order to increase a dioptric power of the accommodating intraocular lens system. In some cases, the posterior intraocular lens May be more rigid than the anterior intraocular lens, and the anterior intraocular lens may be more flexible or elastic than the posterior intraocular lens.