Ophthalmic Lens Edge Coating to Suppress Myopia Rings
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Solution Overview
Problem
Existing methods for applying edge coatings on ophthalmic lenses often result in overflow onto optical surfaces, compromising aesthetics and making it difficult to achieve uniform coverage on complex lens facets, leading to visible myopia rings and white rings.
Innovation Solution
The ophthalmic lens features a planar edge surface with a coating material that reduces reflections, forming a uniform layer to suppress myopia rings, and optionally includes a structural element for fastening to an eyewear frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If coating material is applied on the edge of an ophthalmic lens using a marker pen, brush, or spray coating, then the myopia rings and white rings are masked effectively, but excess coating material overflows onto the optical surfaces compromising aesthetics
Solution Approach 1:
The edge surface is segmented into multiple facets, and the coating process is divided into multiple scanning passes. The coating head scans each facet sequentially, applying coating material in controlled segments rather than attempting to coat the entire edge surface in one pass, thereby preventing overflow onto optical surfaces.
Solution Approach 2:
The method performs preliminary detection of the lens edge geometry and facilitates preliminary positioning of the coating head before actual coating application. This preliminary action enables the system to plan the coating path and adjust parameters to avoid overflow while ensuring complete coverage of all facets.
2Adaptability or versatility
If the edge surface has complex facets, then the lens can be fitted into various eyewear frames, but it is very difficult to ensure complete coating coverage on each and every facet without introducing overflows on the optical surfaces
Solution Approach 1:
The coating head position and orientation are dynamically adjusted during the coating process. The system continuously adapts the coating parameters based on real-time feedback about the facet geometry, enabling complete coverage on complex multi-faceted edges while maintaining precision and preventing overflow.
Solution Approach 2:
The system uses feedback from detection of the lens edge geometry and coating application status to adjust coating parameters. This closed-loop control ensures that each facet receives appropriate coating coverage while automatically preventing overflow onto optical surfaces, regardless of the complexity of the facet structure.
3Ease of manufacture
If an opaque coating is deposited on the edge surface to reduce visibility of myopia rings and white rings, then aesthetic appearance is improved, but the coating material must have good opacity, finishing, mechanical, and adhesion properties which are difficult to achieve uniformly
Solution Approach 1:
The system dynamically changes coating parameters such as coating head speed, distance from the lens surface, and coating material flow rate during the coating process. These parameter adjustments are made in real-time to optimize coating quality on each facet, ensuring uniform opacity, finishing, mechanical properties, and adhesion across the entire edge surface.
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
The solution effectively reduces or eliminates myopia rings by ensuring consistent coating coverage and prevents reflections from angular edges, enhancing the lens's appearance and ease of fitting into eyewear frames.
Implementation Method 1
a coating material effective to reduce a reflection caused by a profile of the edge surface
Data Source
AI summary
An ophthalmic lens is provided. The ophthalmic lens includes a first optical surface, an opposing second optical surface and an edge surface connecting the first optical surface and the second optical surface, wherein the edge surface is planar. The ophthalmic lens further includes a first layer disposed on the edge surface, wherein the first layer includes a coating material effective to reduce a reflection caused by a profile of the edge surface, and wherein (a) the first layer defines a structural element for fastening the ophthalmic lens to an eyewear frame, or (b) the ophthalmic lens further includes a second layer disposed on the first layer, wherein the second layer defines a structural element for fastening the ophthalmic lens to an eyewear frame. A method of manufacturing the ophthalmic lens and an eyewear including the ophthalmic lens are also provided.