Eyeglass Frame Orientation Measurement via Image Capture
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Solution Overview
Problem
Current methods for determining the geometrico-morphological parameters for personalized optical design of eyeglasses lenses are cumbersome, inaccurate, and require multiple tools, leading to inefficiencies and potential errors in measuring the orientation and positioning of lenses relative to the wearer's head.
Innovation Solution
A method and device utilizing a position-identification system with horizontal and vertical identification elements mounted on the eyeglasses frame or lenses, capturing images to measure geometrical characteristics, and processing these to calculate the orientation components of the lenses relative to the wearer's head, allowing for accurate determination without direct contact or extensive manipulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple different tools (rule, protractor, pupillometer) are used to measure geometrico-morphological parameters, then the measurement coverage is comprehensive, but the operation complexity and time consumption increase significantly
Solution Approach 1:
The patent combines multiple measurement functions (curvature angle, pantoscopic angle, pupillary distance, vertex distance) into a single integrated image capture apparatus. The apparatus uses one device to capture images that contain all necessary measurement information, eliminating the need for separate tools like rules, protractors, and pupillometers.
Solution Approach 2:
The image capture apparatus serves multiple measurement functions simultaneously. It captures images that enable determination of frame orientation angles, pupillary distances, and vertex distances through image processing, making the device universal for all geometrico-morphological parameter measurements.
2Ease of operation
If manual estimation with rules and protractors is used to measure lens orientation parameters, then the measurement process is simple to set up, but the measurement accuracy deteriorates
Solution Approach 1:
The patent replaces manual mechanical measurement tools (rules, protractors) with an automated image capture and processing system. The apparatus captures images and uses image processing algorithms to automatically determine measurement values, eliminating manual estimation and improving accuracy while maintaining ease of operation.
3Reliability
If curvature angle and pantoscopic angle measurements are combined to determine lens orientation, then the orientation can be calculated, but errors propagate and reduce reliability
Solution Approach 1:
The patent uses image capture to create a visual copy of the frame and lens configuration. By processing this image copy, the system directly determines orientation parameters without relying on separate angle measurements that would propagate errors. The image serves as a faithful representation from which all measurements are derived simultaneously.
Data Source
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AI summary
The invention relates to a device and to a method for determining under wearing conditions at least one component of the orientation of a correcting ophthalmic lens of eyeglasses relative to the head of a future wearer. Provision is made for mounting a position-identification system (20) on the frame (10) and/or on a presentation lens fitted to the frame, which system (20) includes at least one identification element (60, 70, 80) having at least one known geometrical characteristic, for capturing the image of the identification element in two dimensions in a vertical facial plane, for processing said captured image to measure the captured geometrical characteristic of the image of the identification element that depends on the known geometrical characteristic of the identification element, and for calculating at least one component of the orientation of the lens by comparing the captured geometrical characteristic with the known geometrical characteristic. The invention also relates to a method of optically designing the correcting lens.