Rimless Lens Centering via Reference Frame Transformation
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Solution Overview
Problem
The existing method for centering ophthalmic lenses on rimless eyeglass frames requires multiple templates for different lens shapes, limiting flexibility and convenience, as it necessitates identical template shapes to the desired lens shapes for accurate pupillary height measurements.
Innovation Solution
A method that allows centering a target ophthalmic lens on a rimless frame with an arbitrary outline by measuring pupillary height on a template lens of a different shape, using a presentation frame and lens with anchor points, and transferring measurements to the target lens, enabling accurate positioning without needing identical template shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the existing method uses templates with identical shapes to the desired lens shapes for accurate pupillary height measurements, then measurement accuracy is improved, but device complexity and the need for multiple templates increase
Solution Approach 1:
The patent applies universality by introducing a frame of reference system that can accommodate any lens shape. Instead of requiring separate templates for each lens shape, a single frame of reference (comprising the frame and measurement means) can measure pupillary height for lenses of any shape by establishing coordinate systems and transforming measurements between different reference frames. This makes the measurement system universal rather than shape-specific.
Solution Approach 2:
The patent uses an intermediary approach by introducing a frame of reference as a mediator between the measurement means and the target lens. The frame of reference includes coordinate systems that can be established on any lens shape, and transformation means that convert measurements from one reference frame to another. This intermediary system allows accurate measurement without requiring the template to match the lens shape.
2Measurement precision
If the existing method requires identical template shapes to the desired lens shapes, then measurement accuracy is improved, but ease of operation and flexibility decrease
Solution Approach 1:
The frame of reference system provides universality by enabling the same measurement apparatus to accurately measure pupillary height for any lens shape. The coordinate system can be established on the frame itself or on any lens, and transformation algorithms convert measurements between different reference frames, making the system versatile and easy to operate across different lens shapes without sacrificing accuracy.
3Measurement precision
If multiple templates for different lens shapes are maintained, then measurement accuracy for various shapes is improved, but loss of time and productivity decrease
Solution Approach 1:
The patent eliminates the need to switch between multiple templates by implementing a universal frame of reference system. The measurement means can establish a coordinate system on the frame or any lens and use transformation algorithms to accurately determine pupillary height for any lens shape. This single-system approach saves time by eliminating template selection and switching operations while maintaining measurement accuracy across all lens shapes.
Data Source
AI summary
A method of centering a target ophthalmic lens presenting a known shape on a target rimless frame, includes identifying the pupillary point on the presentation lens of a presentation frame identical to the target frame, measuring the pupillary height and the pupillary half-distances of the pupillary points, identifying the optical frame of reference of the target lens, transferring the pupillary height and the pupillary half-distances onto the target lens, and deducing the centering position of the target lens. For the presentation lens presenting an outline different from the outline that the target lens will have after edging, the measurements on the presentation lens are taken in a frame of reference associated with the presentation lens, and the position of the target lens is deduced in a frame of reference associated with the target frame.