Ophthalmic Lens Orientation Apparatus Using Dual-Angle Camera System
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Solution Overview
Problem
Existing installations for determining the orientation of ophthalmic lenses in spectacle frames provide good but not precise enough evaluations, and require specialized skills to operate, necessitating a more precise and user-friendly solution.
Innovation Solution
An installation with two cameras positioned at different angles to simultaneously record images of tracking equipment on the frame, allowing for precise calculation of the inclination of the frame's half-parts using calibration marks and processing means to determine the relative position of reference marks, thereby enhancing measurement precision and ease of use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single camera is used to record the tracking equipment, then the device complexity is reduced, but the measurement precision of the frame inclination is insufficient
Solution Approach 1:
The patent introduces a second camera positioned at a different spatial location and viewing angle to capture the tracking equipment. This multi-dimensional approach allows for more accurate calculation of the frame's inclination by comparing the apparent positions of reference marks across multiple perspectives, thereby improving measurement precision while accepting increased device complexity.
2Measurement precision
If specialized skills are required to operate the installation, then the measurement precision can be maintained, but the ease of operation deteriorates
Solution Approach 1:
The installation automatically processes the images captured by the cameras and calculates the frame inclination without requiring manual measurement or specialized operator skills. The system performs self-service by using processing means to evaluate the relative position of reference marks and determine the inclination value, thereby improving ease of operation while maintaining measurement precision.
3Measurement precision
If two cameras are used to record images at distinct angles, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The patent employs two cameras positioned at different spatial locations and viewing angles to capture images of the tracking equipment. This multi-dimensional recording approach enables more accurate determination of the frame's inclination by analyzing the relative positions of reference marks from multiple perspectives, thereby improving measurement precision while accepting the necessary increase in device complexity.
Data Source
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AI summary
The invention relates to an apparatus for determining the orientation of ophthalmic lenses (20, 22). The apparatus comprises a recording device and a reference-frame unit that can be fitted onto a frame (14) while a patient is wearing it. Said frame has two half parts (11, 13) and a central bridge (15). The reference-frame unit comprises a first element forming an arch (24) that has a central portion (26) indicated by a first reference mark (54), and a second element (56) indicated by a second reference mark (58), mounted on said frame. According to the invention, the apparatus comprises two cameras (60,62) separated vertically from each other and pointing at the eyes from two angles of view (64, 66); and the two cameras (60, 62) enable two images of said reference-frame unit (24, 56) to be recorded simultaneously in order to evaluate the relative positions of the two reference marks (54, 58) and provide a value that represents the slope of said half parts (11, 13).