Truncated Translating Contact Lens Eyelid Interaction
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Solution Overview
Problem
Existing translating contact lenses for presbyopia correction face challenges in maximizing translation while maintaining comfort, as they do not adequately consider the anatomy and interaction of the eye and eyelids, leading to suboptimal vision and discomfort due to factors like tear film quality, lens fit, and asymmetrical eyelid movement.
Innovation Solution
A truncated contact lens design with parametrized thickness variations and optimized back peripheral radius changes, incorporating asymmetric and ramp shapes to enhance translation and comfort, ensuring smooth interaction with both upper and lower eyelids, and minimizing lens thickness for improved centration and vision correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the lens is designed to maximize translation ability through interaction with eyelids, then lens translation is improved, but comfort deteriorates due to mechanical interaction with eyelids
Solution Approach 1:
The lens incorporates localized thickness variations and specific peripheral zone designs (such as truncated inferior portions or ramp-shaped edges) that create mechanical interaction with eyelids only in specific regions. This allows translation to be driven by eyelid interaction in designated zones while other zones maintain comfort-oriented designs, resolving the contradiction between translation capability and overall comfort.
Solution Approach 2:
The lens is divided into functional zones with different design characteristics - optical zones for vision correction, peripheral zones for translation control, and transition zones for comfort. This segmentation allows each zone to be optimized independently, with peripheral zones designed to interact with eyelids for translation while optical zones maintain comfort and visual performance.
2Measurement precision
If the lens thickness is reduced for improved centration, then centration is improved, but structural integrity and comfort deteriorate
Solution Approach 1:
The lens employs non-uniform thickness distribution with thinnest regions positioned to optimize centration and visual optics, while thicker peripheral regions or reinforced zones maintain structural integrity and comfort. This localized thickness optimization allows the lens to achieve improved centration without compromising overall strength.
Solution Approach 2:
The lens utilizes composite material structures or multi-layer constructions that provide varying mechanical properties in different regions. This allows thin optical zones for centration optimization while incorporating stronger peripheral zones or support structures that maintain structural integrity and comfort during wear.
3Speed
If the lens design is optimized for translation through asymmetric shapes, then translation ability is improved, but manufacturing complexity increases
Solution Approach 1:
The lens incorporates asymmetric designs such as truncated inferior portions, ramp-shaped edges, or non-circular peripheries that create preferential interaction with eyelids to drive vertical translation. These asymmetric features are strategically positioned to maximize translation efficiency while maintaining compatibility with standard manufacturing processes.
Solution Approach 2:
The lens design utilizes controlled variations in geometric parameters (thickness, curvature, peripheral shape) that can be precisely defined through mathematical models and manufactured using modern contact lens fabrication techniques. These parameter changes enable asymmetric translation-optimized designs while maintaining manufacturing feasibility through computer-controlled processing.
4Speed
If the lens interacts more with eyelids to achieve translation, then translation is improved, but comfort deteriorates due to increased mechanical interaction
Solution Approach 1:
The lens design creates localized interaction zones where eyelid contact is concentrated to drive translation, while other regions maintain comfort-oriented designs with smoother edges and optimized fit. This spatial differentiation allows translation to be achieved through focused mechanical interaction in specific zones without compromising overall comfort across the entire lens surface.
Solution Approach 2:
The lens incorporates dynamic features such as flexible peripheral zones or shape-memory materials that adapt to eyelid interaction forces during blinking and eye movements. These dynamic characteristics allow the lens to engage with eyelids for translation when needed while returning to a comfortable neutral position, reducing continuous mechanical stress and improving overall comfort.
Data Source
Figure 1A~1B
Figure 1C
Figure 1D
AI summary
Translating contact lenses which are truncated for correcting presbyopia and whose design is optimized to maximize translation ability while maintaining comfort when the lens is worn on eye. Truncation of the lenses results in a non-round geometry while still retaining under-lid residency in select portions of the lens itself. Maximum thickness and back surface radius of curvature along with ramp shape can be optimized individually or in combination to maximize translation of the lens relative to the eye, when the lens is positioned on eye.