Intraocular Lens Capsule Rim for Rotational Stability and Dysphotopsia
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Solution Overview
Problem
Existing intraocular lenses face issues with rotational instability and negative dysphotopsia, leading to visual disturbances and glare, particularly in patients with larger pupil sizes.
Innovation Solution
Intraocular lenses with a capsule rim that connects the anterior capsule to the lens, providing rotational resistance and sequestering the capsulorhexis opening, combined with a textured surface to diffuse scatter light, and specific optic diameters to manage light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a traditional intraocular lens is used without a capsule rim, then the lens structure is simpler, but the lens experiences rotational instability and visual disturbances
Solution Approach 1:
The lens is divided into distinct functional zones: a central optic for primary vision, a peripheral optic for additional functionality, and a capsule rim separating them. This segmentation allows each zone to perform its specific function while the capsule rim provides rotational stability without compromising overall structural simplicity
Solution Approach 2:
The capsule rim acts as an intermediary structure between the central and peripheral optics, providing rotational resistance and stabilizing the lens position. This mediator element solves the rotational instability problem while maintaining reasonable structural complexity through its specific geometric design
2Object-affected harmful factors
If the capsulorhexis opening edge is exposed, then the lens structure is simpler, but negative dysphotopsia and glare occur
Solution Approach 1:
The capsule rim extracts and sequesters the capsulorhexis opening edge from the optical path, preventing it from causing negative dysphotopsia and glare. By removing the harmful edge exposure while maintaining structural efficiency, this principle reduces harmful factors without excessive complexity
Solution Approach 2:
The capsule rim features asymmetric geometry with a first surface and second surface at different angles to the optic axis, creating rotational resistance and stabilizing lens orientation. This asymmetric design effectively prevents dysphotopsia while maintaining manufacturing feasibility
3Object-affected harmful factors
If a smooth lens surface is used, then manufacturing is easier, but scatter light causes visual disturbances
Solution Approach 1:
The peripheral optic surface is selectively textured while the central optic remains smooth, creating local quality differences. This allows light scattering control in the peripheral region without complicating the manufacturing of the critical central optical zone, effectively reducing dysphotopsia while maintaining ease of manufacture
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 enhances rotational stability, reduces lens rotation, and significantly minimizes negative dysphotopsia by preventing reflections at the capsulorhexis edge, thereby improving visual clarity.
Implementation Method 1
The peripheral optic may additionally comprise a textured surface configured to reduce transmission of or scatter light
Data Source
AI summary
An ophthalmic lens may comprise a posterior optic surface and an anterior optic surface, which may comprise a central optic, a peripheral optic, and a capsule rim separating the central optic and the peripheral optic. An optic edge may couple the posterior optic surface to the peripheral optic. The capsule rim may be symmetric or asymmetric in various embodiments. In more particular embodiments, the capsule rim may form a surface at an angle of at least ninety (90) degrees to the peripheral optic. In some embodiments, the central optic may comprise an optic axis, and the capsule rim may form a surface that is substantially parallel to the optic axis.