Peripheral Light-Blocking Ophthalmic Prosthesis for Dysphotopsia
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Solution Overview
Problem
Existing ophthalmic solutions fail to address light passing through the gap between the iris and intraocular implant lens, leading to negative dysphotopsia, characterized by dark areas or bright lines in the visual field, and positive dysphotopsia, such as glare and halos, which are not effectively mitigated by current intraocular lens designs or surgical placements.
Innovation Solution
An ophthalmic prosthetic with a peripheral light blocking implant member positioned between the iris and intraocular implant lens to block oblique light, featuring customizable thickness, material, and haptics for secure placement, which can be foldable and inserted through small incisions, using biocompatible materials to prevent light from entering the peripheral space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an intraocular implant lens is implanted to treat aphakia, then focusing ability is improved, but light passes through the gap between the iris and lens edge causing negative and positive dysphotopsia
Solution Approach 1:
A peripheral iris prosthesis is introduced as an intermediary component between the iris and the intraocular implant lens. This prosthesis extends from the iris toward the lens edge, creating a barrier that blocks oblique light rays from passing through the gap. The intermediary structure prevents direct light contact with the lens periphery while maintaining the lens's focusing function, thereby eliminating dysphotopsia without compromising visual acuity.
2Object-affected harmful factors
If the intraocular implant lens is positioned to fill the gap between iris and lens, then dysphotopsia is reduced, but surgical complexity and precision requirements increase
Solution Approach 1:
The solution divides the problem into two separate components: the primary intraocular implant lens for focusing and the secondary peripheral iris prosthesis for light blocking. This segmentation allows each component to perform its specific function independently. The prosthesis can be implanted through a separate minimally invasive procedure, avoiding the need for complex single-stage surgery, and reduces precision requirements compared to attempting to reposition the main lens.
3Object-affected harmful factors
If the peripheral iris prosthesis extends fully to block all oblique light, then dysphotopsia is completely eliminated, but visual field restriction and patient discomfort increase
Solution Approach 1:
The peripheral iris prosthesis is designed with spatially varying properties: it is positioned specifically in the peripheral region where oblique light rays pass, rather than uniformly across the entire iris. The prosthesis selectively blocks only the problematic peripheral light paths while leaving the central visual axis unobstructed. This localized approach eliminates dysphotopsia caused by peripheral light while preserving the patient's central visual field and overall visual comfort.
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 prosthetic effectively reduces negative and positive dysphotopsia by blocking oblique light, maintaining visual clarity and reducing glare, while being adaptable to individual eye dimensions and conditions.
Implementation Method 1
The peripheral light blocking implant member may be selectively positioned to block passage of light
Data Source
AI summary
An ophthalmic prosthetic and method for correcting negative and positive dysphotopsia. The ophthalmic prosthetic comprises a peripheral light blocking implant member adapted to locate in a gap between an iris and an intraocular implant lens. The gap is between the anterior surface of the lens and the posterior portion of the iris. An opacity of the peripheral light blocking implant member is selectively positioned to block passage of light.