Modular Intraocular Lens Ring Geometry for Off-Axis Glare
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Solution Overview
Problem
Conventional IOLs cause glare due to off-axis light transmission through the optic and posterior rim, leading to undesirable effects like double-image dysphotopsia, and require larger incisions for implantation.
Innovation Solution
A modular IOL design featuring a ring with a flange that defocuses off-axis light by forming a non-parallel posterior surface profile, minimizing glare and allowing for a smaller incision size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional IOL design with full ring structure is used, then structural stability is improved, but incision size required for implantation increases
Solution Approach 1:
The IOL is divided into modular components: an optic element and a separate ring with haptics. This segmentation allows the optic to be inserted through a smaller incision first, followed by the ring structure, thereby reducing the required incision size while maintaining the structural stability of the complete assembly.
Solution Approach 2:
The optic element is designed to be inserted through and nested within the ring structure during implantation. This nesting approach allows the smaller optic to pass through a reduced incision, after which the larger ring is positioned around it, achieving both small incision requirement and structural stability.
2Device complexity
If conventional IOL design without flange is used, then device complexity is reduced, but glare artifacts increase
Solution Approach 1:
A flange is added only to the posterior surface of the ring at the specific location where off-axis light transmission occurs, rather than modifying the entire device. This localized modification addresses the glare problem caused by off-axis light passing through the posterior rim while keeping the overall device complexity minimal.
Solution Approach 2:
The flange structure, which adds to device complexity, converts the harmful effect of off-axis light transmission into a beneficial defocusing effect. The flange's geometry is specifically designed to intercept and defocus off-axis light rays that would otherwise cause glare artifacts, thereby transforming a potential harm into a functional benefit.
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 design reduces glare artifacts and enables smaller incisions during implantation, improving patient comfort and surgical efficiency.
Implementation Method 1
The flange has a unique geometry to defocus light that enters the IOL off-axis and is transmitted through the optic and the flange
Data Source
AI summary
A modular intraocular lens (IOL) with a ring configured to prevent glare artifacts. The ring includes a flange on the posterior rim, in which an anterior surface on the flange has a first profile and a posterior surface of the flange has a second profile non-parallel with the first profile. Non-parallel surfaces of the flange can be configured to defocus light transmitted at off-axis angles through an optic and the flange.