Intraocular Lens Transition Surface for Slope Continuity
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Solution Overview
Problem
Current intraocular refractive implants with coaxial diopters suffer from uncontrolled light ray trajectories at connection zones due to breaks in slope, leading to visual discomfort for the wearer.
Innovation Solution
The design incorporates a transition surface between primary and secondary optical surfaces, with a radial extension around the primary axis, ensuring a continuous tangent orientation change from primary to secondary orientation, minimizing breaks in slope and enhancing light ray control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If coaxial refractive diopters are used to provide multiple optical corrections, then the vision range is extended, but breaks in slope at connection zones cause uncontrolled light ray trajectories and visual discomfort
Solution Approach 1:
The patent introduces a transition surface as an intermediary element between the first and second optical surfaces. This transition surface acts as a mediator that gradually changes the slope orientation from the first surface's orientation to the second surface's orientation, preventing abrupt breaks in slope. The transition surface includes transition zones with progressively changing normal vectors, which control light ray trajectories smoothly and eliminate visual discomfort while maintaining the extended vision range provided by the coaxial refractive diopters.
Solution Approach 2:
The patent employs curved surfaces and gradual slope transitions instead of abrupt planar changes. The transition surface between coaxial refractive diopters features continuous curvature variations that smoothly connect different optical zones. This curvature approach ensures that light rays passing through connection zones follow controlled trajectories, eliminating the breaks in slope that cause visual discomfort while preserving the multifocal optical corrections.
2Adaptability or versatility
If multiple macroscopic zones with different diopters are implemented, then near and far vision are corrected, but the connection zones create breaks in slope that disrupt light ray control
Solution Approach 1:
The transition surface serves as an intermediary structure between macroscopic zones with different diopters. It includes progressive transition zones where the slope orientation changes gradually from one zone to another, maintaining precise control over light ray trajectories. This intermediary structure eliminates abrupt breaks in slope while preserving the distinct optical properties of each macroscopic zone, thereby maintaining both focal point coverage and manufacturing precision.
Solution Approach 2:
The patent applies different surface characteristics to different regions: macroscopic zones maintain their distinct diopter values for specific focal corrections, while transition zones between them feature gradually changing slope orientations. This local differentiation allows each zone to fulfill its specific optical function while the transition zones ensure smooth light ray control, resolving the contradiction between focal point coverage and trajectory control precision.
3Device complexity
If abrupt transitions between optical surfaces are used, then the implant structure is simplified, but light ray trajectories become uncontrolled at connection zones
Solution Approach 1:
The patent replaces abrupt planar transitions with curved transition surfaces that gradually change slope orientation. This curvature approach maintains relatively simple implant geometry while ensuring continuous control over light ray trajectories. The transition surfaces use smooth curvature variations rather than complex multi-component structures, achieving precise light control without significantly increasing device complexity.
Solution Approach 2:
The transition surface ensures continuous control of light ray trajectories across the entire implant surface, including connection zones between optical surfaces. By maintaining continuous slope transitions rather than abrupt changes, the patent preserves precise light ray control throughout the implant structure without requiring complex additional components, thus balancing simplicity with optical precision.
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
This design improves light ray control and reduces visual discomfort by ensuring consistent focal points within the implant's transition zone, maintaining optical performance and patient acceptability.
Implementation Method 1
Each interface has a particular set of optical properties... through which the light rays are deflected according to the Snell-Descarte law
Data Source
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AI summary
The invention proposes an intraocular optical implant (10) comprising a transition surface between primary (18) and secondary (24) optical surfaces in which: - a considered radial cutting plane intersects the primary optical (18), transition and secondary optical (24) surfaces respectively along a primary section, a transition section and a secondary section; - in any considered cutting plane containing the primary axis (O1) and included in the angular sector of transition around the primary axis, the transition surface presents, at any given point of the transition section, a local transition tangent to the transition section whose orientation is included in the angular range from the primary orientation of the primary tangent at the primary transition point, to the secondary orientation of the secondary tangent at the secondary transition point.