Active Display Visual Tracking for Ophthalmic Lens Design
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Solution Overview
Problem
Current vision-testing devices are inaccurate for determining visual behavior, especially for progressive ophthalmic lenses, as they often require unnatural postures and are influenced by vision-correcting means, leading to suboptimal optical design.
Innovation Solution
A testing device with an active display and controlling unit that tracks a visually predominant target in a sequence following a visual tracking protocol, allowing natural reading behavior to be assessed without vision-correcting equipment, capturing images to determine optical design parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If vision-testing devices are used to determine visual behavior, then measurements can be obtained, but the measurements are inaccurate because they require unnatural postures and are influenced by vision-correcting means
Solution Approach 1:
The patent replaces traditional mechanical vision-testing devices with a digital display system that presents visual targets on a screen. This substitution allows for flexible presentation of visual stimuli without the physical constraints of traditional testing equipment, enabling more natural viewing distances and postures while maintaining measurement accuracy through digital control of target position and characteristics.
Solution Approach 2:
The patent changes the parameters of the visual testing system by allowing variable display positions, sizes, and characteristics of visual targets through software control. This enables adaptation of the testing protocol to match natural reading behaviors, such as varying text positions and sizes, while eliminating the need for fixed, unnatural viewing distances required by traditional devices.
2Adaptability or versatility
If vision-correcting means are worn during measurements, then individuals with poor sight can perform visual tasks, but the measurements are corrupted by the prismatic effect of the correction
Solution Approach 1:
The patent extracts the visual correction function from the testing process by allowing participants to remove their vision-correcting means during measurement. The system compensates for individual visual characteristics through software algorithms that analyze gaze patterns and head positions, separating the correction function from the measurement process to eliminate prismatic effects while maintaining the ability to assess visual behavior in natural conditions.
Solution Approach 2:
The patent introduces digital imaging and gaze-tracking technology as an intermediary between the participant and the visual targets. This intermediary system captures head and eye position data to indirectly measure visual behavior without requiring direct optical correction during testing, thereby eliminating the corrupting influence of prismatic effects while still enabling participants with poor sight to perform visual tasks.
3Productivity
If traditional vision-testing devices are used, then measurements can be taken, but the optical design parameters determined are not representative of actual visual behavior under natural conditions
Solution Approach 1:
The patent introduces dynamic elements to the testing system by allowing participants to move their heads and eyes naturally while viewing visual targets displayed on a screen. The system dynamically tracks head and gaze positions using imaging sensors and algorithms, capturing real-time movement patterns that reflect natural reading behaviors. This dynamic approach replaces static, fixed-position traditional testing methods, enabling determination of optical design parameters that accurately represent actual visual behavior under natural conditions.
Data Source
AI summary
A device for testing visual behavior of a person, including: an active display configured to display at least one visually predominant target in a plurality of positions that are variable over time and that are aligned along at least one line or column, and a unit for controlling the display. The unit is programmed so that consecutive display positions of the target follow, over time, a visual tracking protocol.