Dynamic Eye Sensitivity Measurement for Progressive Power Lens Setting
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Solution Overview
Problem
Existing methods for measuring the field of view of a subject fail to account for sensitivity around a specific line of sight, leading to variations in image blurring in the intermediate and near vision parts of progressive power lenses, which differ between individuals.
Innovation Solution
A method involving a display device secured to the subject's head to show a predetermined pattern on a screen, with a fixation target and a change region around the intersection point, allowing the subject to sense the change region's movement, enabling sensitivity measurement around a certain line of sight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a field of view measurement method is used that only measures in the state where the subject looks forward straightly, then the measurement procedure is simple, but it fails to measure sensitivity of the eye around a line of sight in a certain direction
Solution Approach 1:
The patent introduces dynamic measurement by moving the change region between the fixation target and the periphery during the measurement process. The change region is displayed at multiple positions along a predetermined path, requiring the subject to track and report changes dynamically. This dynamic approach enables measurement of eye sensitivity around a line of sight while maintaining operational feasibility through automated position control.
Solution Approach 2:
The patent employs preliminary action by first establishing a fixation target at the center of the display screen and guiding the subject to focus on it before introducing the change region. The measurement path and change region movement are pre-planned, with the change region systematically moved along a predetermined trajectory from the periphery toward the fixation target. This structured approach ensures comprehensive coverage of the field of view while maintaining simplicity.
2Ease of manufacture
If progressive power lens is designed with standard refractive power distribution, then the lens manufacturing is simplified, but image blurring occurs in the side area of intermediate vision part or near vision part
Solution Approach 1:
The patent applies local quality by measuring eye sensitivity at different locations around the line of sight and using these location-specific data to customize the refractive power distribution in corresponding regions of the progressive power lens. The refractive power is adjusted locally in the intermediate vision part and near vision part based on the measured sensitivity at specific angular positions, thereby reducing image blurring in the side area while maintaining overall lens functionality.
Solution Approach 2:
The patent utilizes parameter changes by modifying the refractive power distribution parameters of the progressive power lens based on the measured eye sensitivity data. The spherical power, cylindrical power, and addition power are adjusted as parameters in the refractive power distribution to match the individual's eye sensitivity characteristics. This parameter optimization reduces image blurring in the side area while maintaining manufacturing feasibility through standard lens design processes.
3Adaptability or versatility
If individual eye sensitivity is considered in progressive power lens design, then the lens becomes more suitable for each purchaser, but the measurement and design process becomes more complex
Solution Approach 1:
The patent replaces complex manual measurement procedures with an automated optical measurement system. A display device presents visual stimuli at controlled positions, and a detection device automatically records the subject's responses to determine eye sensitivity. This substitution of manual processes with automated optical and electronic systems simplifies the measurement process while enabling individual customization. The system automatically processes the measurement data to generate personalized refractive power distribution parameters.
Data Source
AI summary
A measuring method for measuring sensitivity of eye around certain line of sight includes: showing image of predetermined pattern on a display screen showing in front of eyeball of subject by display device secured to head; showing fixation target focused on by subject, on display screen to make line of sight of subject; showing change region where predetermined pattern image is changed, at anisotropic area around intersection point or fixation target in screen is separated from intersection point and fixation target, intersection point wherein subject certain line of sight focuses on fixation target, crosses display screen; showing change region where predetermined image pattern is changed on display screen, wherein change region manner is continuously or intermittently brought close to or away from intersection point or fixation target in display screen; and determining range wherein subject senses change region by bringing it close or away from intersection point or fixation target.