Ophthalmic Lens Bezel Profile Determination for Frame Fitting
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Solution Overview
Problem
The existing methods for fitting ophthalmic lenses to eyeglass frames are time-consuming and require multiple measurements to achieve precise nesting, leading to inefficiencies in the optician's process.
Innovation Solution
A method that determines the shape of the bezel profile at a single point on the temple portion of the frame, allowing for the calculation of trimming parameters and bevel optimization to ensure precise fitting, including the use of database comparisons and 3D rim-shaping machine analysis to deduce the tilt angle and aperture angle, thereby simplifying the lens trimming process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the geometrical data of the bezel is determined at numerous points on the contour of the rims, then the manufacturing precision of lens fitting is improved, but the time required for measurements increases significantly
Solution Approach 1:
The invention extracts only the essential geometrical characteristics (aperture angle A, aperture D, and tilt angle) from the complete bezel geometry at a single strategic point on the temple portion, rather than measuring all points on the contour. This selective extraction maintains sufficient precision for lens fitting while dramatically reducing measurement time.
Solution Approach 2:
The invention changes the approach from measuring multiple spatial points to measuring fewer points with more comprehensive parameter extraction. By determining the aperture angle, aperture width, and tilt angle at one point, the system captures the essential bezel characteristics needed for precise lens fitting without the time cost of comprehensive contour mapping.
2Loss of information
If the shape of the bezel is measured at multiple points along the rim contour, then the completeness of geometrical data is improved, but the complexity of the measurement process increases
Solution Approach 1:
The invention extracts the essential geometrical information (aperture angle, aperture, and tilt angle) from a single measurement point rather than collecting data from multiple points. This extraction approach provides sufficient information for lens fitting while significantly simplifying the measurement process and reducing operational complexity.
Solution Approach 2:
The invention performs preliminary analysis of the bezel geometry by measuring key parameters at one point before proceeding to lens fitting. This preliminary characterization of the bezel's aperture and tilt properties provides all necessary information for subsequent lens trimming and bevelling operations, eliminating the need for complex multi-point measurements.
Data Source
AI summary
A method of determining parameters for fitting an ophthalmic lens to a frame, including the following steps: providing an eyeglass frame including at least one temple portion having a bezel intended to enable the nesting of an ophthalmic lens; and determining the shape of the profile of the bezel at a point in the temple portion of said frame. Associated method of fabricating an ophthalmic lens.