Soft Contact Lens with Segmented Curvature to Prevent Corneal Attachment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Soft contact lenses with low water content or no water content tend to attach excessively to the cornea, leading to poor stability and reduced visual acuity correction due to their design limitations in base curve and sagittal depth.
Innovation Solution
A soft contact lens design with distinct radii of curvature for the central, intermediate, and outer edge parts, along with through holes in the intermediate part, to suppress attachment while maintaining oxygen permeability and fitting properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a soft contact lens with low water content or no water content is used to improve oxygen permeability, then oxygen permeability is improved, but the lens tends to attach excessively to the cornea
Solution Approach 1:
The contact lens is divided into multiple regions with different radii of curvature: a central part, an intermediate part with through holes, and an outer edge part. This segmentation allows each region to serve different functions - the central part maintains optical quality, the intermediate part with through holes reduces attachment, and the outer part provides stable fitting
Solution Approach 2:
Different regions of the contact lens are given different local properties. The intermediate part specifically has through holes and a distinct radius of curvature to reduce attachment, while other regions maintain their conventional properties for optical and fitting purposes
2Object-affected harmful factors
If a large base curve is designed to reduce attachment, then attachment is reduced, but the sagittal depth becomes small causing loose fitting
Solution Approach 1:
The lens is segmented into regions with different radii of curvature, allowing the outer edge part to provide stable fitting while the intermediate part reduces attachment
Solution Approach 2:
The intermediate part is given a specific radius of curvature smaller than both the central and outer edge parts, creating a localized region that reduces attachment without compromising overall fitting stability
3Stability of the object's composition
If the sagittal depth is increased to improve fitting stability, then fitting stability is improved, but the lens diameter must be increased which is restricted by eye structure
Solution Approach 1:
By segmenting the lens into regions with different radii of curvature, the design achieves adequate sagittal depth and fitting stability without requiring an increased overall lens diameter
Data Source
Figure 1(a)~1(b)
Figure 2~3
Figure 4(a)~4(b)
AI summary
Provided is a soft contact lens including a silicone compound as a constituent component that is capable of suppressing attachment onto a cornea during wearing and has excellent fitting properties and a method for suppressing attachment of the soft lens onto the cornea. The contact lens 10 is a soft contact lens having no water content or low water content and includes a circular central part 1 positioned at the center, an intermediate part 2 positioned at the outer peripheral side of the central part 1 and forming an annular shape having a center coaxial with the central part 1, and an outer edge part 3 positioned at the outer peripheral side of the intermediate part 2 and forming an annular shape having a center coaxial with the central part 1, in which respective radii of curvature of the central part 1, the intermediate part 2, and the outer edge part 3 of the contact lens 10 are different from each other, and a sagittal depth of the contact lens 10 is within a range of a sagittal depth in the case where the entire soft contact lens is formed in a range of an radius of curvature ±0.2 mm of the outer edge part 3.