3D Ophthalmic Lens Fitting for Precise Personalized Lens Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for determining the position of an ophthalmic lens on a spectacle frame are imprecise, leading to significant errors in personalized lens design due to the neglect of the lens's shape, curvature, and axial position within the frame, as well as variations in the radius of the eye, which affects the calculation of optical power distribution.
Innovation Solution
A method and system for determining the fitted position of an ophthalmic lens on a spectacle frame using 3D data to define the lens's geometry and position relative to the wearer's head, incorporating frame and lens 3D data to accurately fit the lens within the frame, and calculating a personalized lens design based on the eye's rotation center.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual measurement with a ruler against a theoretical plane is used, then the measurement process is simple and quick, but the measurement precision is poor due to neglecting lens shape, curvature, and axial position
Solution Approach 1:
The patent transitions from 2D manual ruler measurements against a theoretical plane to 3D optical coherence tomography imaging. This dimensional upgrade enables capturing the lens's shape, curvature, and axial position simultaneously, resolving the measurement precision issue while the automated processing keeps system complexity manageable.
Solution Approach 2:
The patent replaces the mechanical manual measurement system with an optical-based OCT imaging system. This substitution eliminates the need for physical contact and manual reading, providing non-contact, high-precision measurement of lens parameters including axial position, curvature, and shape without significant increase in operational complexity.
2Reliability
If approximation of fitting parameters from a theoretical plane is used, then the measurement process is simplified, but the reliability of lens design calculation deteriorates due to significant errors
Solution Approach 1:
The patent creates a precise 3D digital copy of the lens and its mounting position using OCT imaging. This virtual model accurately represents the physical lens's shape, curvature, and axial position, enabling reliable lens design calculations without the errors introduced by theoretical plane approximations. The digital copy can be manipulated and analyzed without additional physical complexity.
3Manufacturing precision
If the position of the center of rotation of the eye is deduced approximately from the cornea position, then the measurement process is simple, but the manufacturing precision of the lens deteriorates due to variation in eye radius
Solution Approach 1:
The patent uses OCT imaging as an intermediary to directly visualize and measure the eye's center of rotation position and the lens position simultaneously. This eliminates the need to deduce the center of rotation from corneal position with assumed eye radii. The intermediary imaging system provides direct, accurate measurements that account for individual variations in eye geometry, improving lens manufacturing precision.
Data Source
AI summary
A method for determining a fitted position of an ophthalmic lens to be mounted on a spectacle frame equipping a wearer, the fitted position being defined with respect to a wearer referential linked to the head of the wearer. The method includes defining at least one fitting criteria relating to the positioning of the ophthalmic lens with respect to the spectacle frame, determining frame 3D data at least partially representative of the geometry and position of the spectacle frame with respect to the wearer referential, determining lens 3D data at least partially representative of the geometry of at least a peripheral portion of the ophthalmic lens, and determining the fitted position of said ophthalmic lens with respect to the wearer referential using the frame 3D data and said lens 3D data to fit the ophthalmic lens within the spectacle frame meeting the fitting criteria.