Universal Scleral Landing Zone for Consistent Lens Alignment
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Solution Overview
Problem
Current scleral contact lens designs require complex parameter selection and instrumentation for precise fitting, leading to excessive time consumption and high reorder rates due to inconsistent alignment and failure in achieving full limbal clearance, which can result in mechanical trauma and staining.
Innovation Solution
A novel universal scleral landing zone design that eliminates the need for managing the radius or angle of the landing zone, using a single convex to the eye radius based on conjunctival compression depth and predetermined width, allowing for empirical selection of parameters without the need for ocular contour measurement instruments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If complex parameter selection and instrumentation are used for precise fitting, then alignment consistency and limbal clearance are improved, but time consumption and device complexity increase
Solution Approach 1:
The patent changes the geometric parameters of the landing zone (making it flatter with a longer radius of curvature) to reduce the sensitivity of lens alignment to parameter variations, thereby achieving consistent alignment without requiring complex measurement and adjustment procedures
Solution Approach 2:
The patent extracts the alignment control function from the complex parameter selection process and embeds it directly into the lens design through the modified landing zone geometry, eliminating the need for separate alignment adjustment steps
2Manufacturing precision
If complex parameter selection and instrumentation are used for precise fitting, then limbal clearance is improved, but device complexity increases
Solution Approach 1:
The patent performs the alignment control action in advance by designing the landing zone with a flatter geometry and longer radius of curvature, so that the lens naturally achieves proper limbal clearance and alignment upon insertion without requiring complex instrumentation or adjustment procedures
3Adaptability or versatility
If traditional landing zone design with adjustable radius and angle is used, then adaptability to different eyes is improved, but ease of operation decreases
Solution Approach 1:
The patent designs the landing zone to be universal across different eye types by making it flatter and extending its radius of curvature, allowing a single lens design to achieve proper alignment and clearance for a wide range of patients without requiring customization or complex fitting procedures
Data Source
AI summary
In general, one aspect disclosed features a scleral contact lens for an eye of a patient, the scleral contact lens comprising: an anterior surface; and a posterior surface, the posterior surface comprising: a central optic zone defined by a base curve according to an apical radius of the cornea of the eye; a peripheral corneal zone peripheral to the central optic zone, a clearance control zone peripheral to the optic zone, and a scleral landing zone peripheral to the clearance control zone, the scleral landing zone having a single surface shape.