Aspherical Multifocal Intraocular Lens Design
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Solution Overview
Problem
Existing intraocular lenses often result in aberrations, a 'halo' effect, reduced contrast, and brightness due to their design.
Innovation Solution
An aspheric intraocular lens with an additional lens surface on the posterior portion, integrated with a haptic system that securely mounts the lens centrally within the lens capsule, minimizing aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional intraocular lens designs are used, then the lens can be implanted to replace the natural lens, but aberrations and halo effect occur reducing visual quality
Solution Approach 1:
The lens is divided into multiple functional zones with different optical powers: a central zone for distance vision and peripheral zones for near vision. This segmentation allows each zone to be optimized independently, reducing overall aberrations while providing multifocal functionality.
Solution Approach 2:
Different regions of the lens are given different optical properties - the central portion has one refractive index optimized for distance, while peripheral portions have different refractive indices optimized for near vision. This local differentiation minimizes halo effects and improves overall visual quality.
2Reliability
If the lens is mounted centrally within the lens capsule, then visual symmetry is improved, but precise central mounting is difficult to achieve
Solution Approach 1:
The haptic system is designed to automatically center the lens within the lens capsule through its own structural properties. The haptic arms engage with the lens capsule in a way that inherently provides central positioning without requiring complex external alignment mechanisms.
Solution Approach 2:
The haptic system employs asymmetric arm configurations that create a natural centering effect. The non-uniform geometry of the haptic arms ensures that the lens is pulled into a central position during implantation, compensating for manufacturing tolerances and positioning difficulties.
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 solution effectively reduces aberrations and the 'halo' effect, enhancing contrast and brightness, thereby improving visual outcomes post-cataract surgery.
Implementation Method 1
The lens of the current invention is formed as an aspheric lens with an added lens surface formed on the posterior portion of the lens
Data Source
AI summary
A multifocal intraocular lens has an anterior lens surface which includes a first optic of a first radius and a second optic of a different radius. The posterior surface of the lens includes an aspheric surface.