Progressive Power Lens Design for Visual Behavior Matching
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Solution Overview
Problem
Existing methods for designing progressive power lenses do not accurately replicate the wearer's daily visual behavior, leading to unnecessary eye and head rotations, as they require cumbersome devices and limited viewing angles, which can result in discomfort and inefficient accommodation.
Innovation Solution
A method that determines the relationship between line-of-sight passage positions on the lens and reactive accommodation amounts based on visual behavior, including head and eyeball rotations, to judge if the accommodation is within an appropriate range and correct the lens design accordingly, using a system that ascertains line-of-sight passage positions and reactive accommodation amounts to adjust the progressive power lens design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a head band with cameras and infrared LEDs is attached to measure line of sight, then measurement precision is improved, but device complexity increases and ease of operation deteriorates
Solution Approach 1:
The patent uses image capture devices to photograph the subject's eyes and head, creating visual copies that can be analyzed to determine line-of-sight direction. This avoids the need for complex invasive sensors while achieving accurate measurement through optical copying of visual information.
Solution Approach 2:
The patent replaces mechanical head bands with cameras and infrared LEDs with an optical imaging system using image capture devices. The mechanical measurement apparatus is substituted with optical fields that capture eye and head positions, then process images computationally to derive line-of-sight information.
2Adaptability or versatility
If the subject moves head to distribute line-of-sight over wide angular range, then measurement coverage is improved, but ease of operation deteriorates due to unnatural movement requirements
Solution Approach 1:
The patent measures visual behavior during dynamic head and eyeball movements that occur naturally in daily life. Instead of requiring static positioning or forced wide-angle movements, the system captures line-of-sight data during natural dynamic visual tasks, making the measurement process more comfortable and ecologically valid.
Solution Approach 2:
The subject performs natural visual behaviors during measurement without being instructed to move head or eyes in specific ways. The measurement system passively captures data during self-directed visual exploration, allowing the subject's own visual behavior to serve the measurement purpose without artificial constraints.
3Ease of operation
If calibration is performed without head movement, then ease of operation is improved, but measurement precision deteriorates due to limited viewing angles
Solution Approach 1:
The patent measures line-of-sight in three-dimensional space by capturing both head position and eyeball orientation, then combining these measurements to determine actual viewing direction. This multi-dimensional approach allows accurate line-of-sight calculation even when head movement is minimal, as the system compensates by measuring eyeball rotation in multiple orientations.
Data Source
AI summary
Provided is technology that makes it possible to design a progressive power lens appropriate for visual behavior of a subject. A method for designing a progressive power lens includes: a step (a) of determining a relationship between a line-of-sight passage position on a surface of a progressive power lens through which a line of sight of a subject wearing the progressive power lens passes and a reactive accommodation amount that the subject exhibits when the line of sight passes through the line-of-sight passage position, based on visual behavior of the subject; a step (b) of judging whether or not the reactive accommodation amount is within an appropriate range; a step (c) of determining a correction method for correcting the progressive power lens based on a result of judgement made in the step (b); and a step (d) of correcting a design of the progressive power lens based on the correction method determined in the step (c).