Progressive Lens Selection via Gaze Intersection Measurement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for selecting progressive ophthalmic lenses do not adequately account for individual wearer and frame characteristics, leading to discomfort due to standard progression lengths that may not suit specific users and frames.
Innovation Solution
A method involving personalized measurement of the relative positions of gaze intersection points with the frame's housing plane, using calibrated equipment with reference points to determine the exact progression length needed, allowing for precise selection of lenses that match the wearer's unique frame and gaze directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If standard progression lengths are used for progressive ophthalmic lenses, then manufacturing and selection processes are simplified, but vision comfort is reduced because the progression length may not match individual wearer and frame characteristics
Solution Approach 1:
The patent applies parameter changes by calculating a personalized progression length based on specific geometric parameters of the frame (housing plane angle, pupil position, gaze direction) and wearer characteristics. This transforms the fixed standard progression length into a variable parameter that adapts to individual needs, thereby improving vision comfort while maintaining a systematic selection process.
Solution Approach 2:
The invention introduces dynamics by making the progression length adjustable and adaptable rather than fixed. The method calculates an optimal progression length that varies according to the specific frame geometry and wearer's gaze characteristics, allowing the lens design to dynamically adapt to individual requirements for improved comfort.
2Measurement precision
If personalized measurement of gaze intersection points is performed, then lens selection precision is improved, but measurement and selection complexity increases
Solution Approach 1:
The patent uses an intermediary approach by introducing a camera system and image processing software as mediators to capture and analyze the geometric relationships between frame components, gaze directions, and housing planes. This intermediary system automates the complex measurements, improving precision while managing complexity through technological assistance rather than manual measurement.
Solution Approach 2:
The invention replaces manual mechanical measurement methods with an optical and computational system. Instead of physical measuring tools, the patent uses camera imaging and digital image processing to determine geometric parameters, thereby improving measurement precision while substituting complex mechanical measurement procedures with more accurate optical and computational methods.
Data Source
Figure 1~3
Figure 4~5
Figure 6
AI summary
The invention relates to a method for selecting progressive ophthalmic lenses for a given frame and wearer, the progressive ophthalmic lenses having one area for distance vision and one area for near vision, said given frame having two recesses suitable for receiving a progressive ophthalmic lens, respectively, said two recesses defining a recess midplane. The method includes the following steps: a) fitting said wearer with said given frame; b) determining the position of a first point of intersection between a first direction of the gaze of said wearer in a distance vision posture and said recess midplane; c) determining the position of a second point of intersection between the gaze of said wearer in a near vision posture and said recess midplane; d) assessing the distance between said intersection points; and, e) selecting progressive ophthalmic lenses in which the progression length corresponds to said distance assessed between said intersection points.