Contact Lens Peripheral Zone Thickness Variation for Stability
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Solution Overview
Problem
Current contact lenses are unstable when worn, prone to decentration due to eye rotation and eyelid movement, leading to discomfort and ineffective vision correction.
Innovation Solution
A stable structure design for contact lenses featuring a central optical zone, a peripheral positioning zone with sequentially obtained preset thickness zones, and an edge zone, allowing for different thicknesses and curvatures to ensure secure positioning on the eye, using equations to calculate and design the surface profiles for stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If contact lenses are made thin and lightweight for comfort, then wearability is improved, but stability and resistance to decentration deteriorate
Solution Approach 1:
The patent applies local quality by creating different thickness zones within the peripheral positioning zone - specifically, a first thickness zone with greater thickness and a second thickness zone with lesser thickness. This localized variation in thickness provides enhanced stability and resistance to decentration in specific areas while maintaining overall lens thinness and comfort for the wearer.
2Ease of manufacture
If contact lenses are made with uniform thickness for simplicity, then manufacturing is easier, but stability during eye movement deteriorates
Solution Approach 1:
The patent segments the peripheral positioning zone into multiple distinct thickness zones (first thickness zone with greater thickness, second thickness zone with lesser thickness) arranged in specific patterns. This segmentation creates a complex thickness distribution that enhances stability during eye movement while providing a clear manufacturing roadmap through defined zone boundaries and thickness values.
Solution Approach 2:
The patent systematically varies the thickness parameter across different zones of the peripheral positioning zone. By defining specific thickness values for the first thickness zone (greater thickness) and second thickness zone (lesser thickness), and specifying their radial positions and angular arrangements, the patent creates a controlled parameter variation that enhances stability while guiding the manufacturing process.
3Ease of manufacture
If contact lenses have flat peripheral surfaces for simplicity, then manufacturing is easier, but resistance to eye rotation and blinking deteriorates
Solution Approach 1:
The patent applies spheroidality by creating curved peripheral surfaces with specific radii of curvature in the peripheral positioning zone. The first and second thickness zones are designed with curved configurations that match the curvature of the eye's cornea and sclera, providing enhanced resistance to eye rotation and blinking while maintaining manufacturability through defined curvature parameters.
Data Source
AI summary
A stable structure design of contact lens includes a central optical zone, a peripheral positioning zone surrounding said central optical zone and an edge zone surrounding said peripheral positioning zone. Rotate axially along the outside of the central optical zone, and obtain at least one preset thickness zone in sequence on the surface of the peripheral positioning zone. According to the at least one preset thickness zone, multiple predetermined thickness values are obtained in the peripheral positioning zone. According to the predetermined thickness values, the peripheral positioning zone can be made to meet the thickness of the predetermined thickness values, that is, in the peripheral positioning zone, a surface with at least one different thickness can be formed to achieve the purpose of forming a stable position and not easy to deviate when wearing the contact lens.