Progressive Lens Design Using Multi-Distance Visual Behavior Measurement
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Solution Overview
Problem
Existing methods for measuring visual behavior with eyeglass lenses, particularly progressive power lenses, are inefficient in capturing behavior at different distances in the depth direction, leading to unnatural postures and discomfort due to inadequate consideration of varying refractive powers, and require burdensome calibration procedures.
Innovation Solution
A method involving the use of sensors to measure head and eyeball rotations while gazing at multiple gaze points at varying distances, allowing for accurate assessment of visual behavior without excessive physical strain, followed by a design process to adjust lens parameters for comfort and natural use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If calibration is performed for objects at different distances in the depth direction, then measurement precision is improved, but measurement time increases significantly
Solution Approach 1:
The patent performs calibration at a single reference distance beforehand, storing the calibration results for later reuse. This preliminary calibration action eliminates the need to repeat time-consuming calibration procedures when measuring visual behavior at different distances, thereby reducing measurement time while maintaining detection precision through the use of stored calibration data.
Solution Approach 2:
The patent creates a copy of the calibration results obtained at one distance and applies this copied calibration data to measurements at different distances. By copying the calibration parameters and transformation matrices, the system avoids redundant calibration procedures while maintaining measurement accuracy across varying depths.
2Measurement precision
If the subject moves the head to distribute line-of-sight directions widely, then calibration accuracy is improved, but the movement becomes unnatural compared to normal viewing behavior
Solution Approach 1:
The patent performs the demanding head movement calibration procedure once in advance as a preliminary action, capturing a wide range of line-of-sight directions. After this initial calibration, the system can measure visual behavior at different distances without requiring the subject to repeat unnatural head movements, thereby maintaining calibration accuracy while improving ease of operation during actual measurements.
3Loss of time
If visual behavior is not measured at multiple distances, then measurement time is reduced, but the lens design fails to accommodate natural visual behavior leading to discomfort
Solution Approach 1:
The patent performs a single comprehensive calibration at a reference distance as a preliminary action, capturing transformation matrices that encode visual behavior characteristics. These pre-captured calibration data enable the system to assess visual behavior at multiple distances without additional calibration time, while still providing sufficient information for adaptable lens design that accommodates natural viewing patterns across different depths.
Data Source
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AI summary
Provided is technology that makes it possible to measure visual behavior with respect to objects that are at different distances in the depth direction, while reducing burden on a subject. A method for measuring visual behavior of a subject to design an eyeglass lens includes: a step (a) of ascertaining a head rotation amount that is generated by the subject in a sagittal plane of the subject when gazing at each of a plurality of gaze points that are set at predetermined distances different from each other in a forward depth direction; and a step (b) of determining an eyeball rotation amount that is generated by the subject when gazing at each of the plurality of gaze points, based on the head rotation amount.