Optometric Shutter Control for Near Vision Testing
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Solution Overview
Problem
Existing optometry devices are inadequate for testing near vision conditions, as they often fail to account for differences in eye refraction and accommodation between far and near vision, and are not designed for comfortable, controlled testing in natural postures.
Innovation Solution
A portable optometric testing device using shutters and a mobile display system to alternate images between two eyes at different frequencies and duty cycles, allowing for binocular and monocular vision testing in various postures, including near vision conditions, with the ability to adjust contrast for improved image fusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If known devices and methods are used for binocular testing, then far vision testing is achieved, but near vision testing conditions are not optimized
Solution Approach 1:
The patent implements dynamic shutter control that alternates between eyes at different frequencies and duty cycles, allowing the system to adapt to near vision conditions while maintaining measurement precision. The shutters dynamically switch states based on synchronization signals to present different images to each eye at optimized timing.
Solution Approach 2:
The patent changes key parameters including shutter frequency (at least 60 Hz), duty cycle ratios between eyes, and image presentation timing to optimize near vision testing. These parameter changes enable the system to account for accommodation and convergence differences in near vision while maintaining far vision testing capability.
2Ease of operation
If trial frames or straightforward methods are used for near vision testing, then portability is improved, but testing control and comfort are worsened
Solution Approach 1:
The patient can adjust the mobile display distance and orientation to achieve their natural, preferred, comfortable posture for the specific task being tested. The system adapts to the patient's self-selected positioning rather than requiring fixed device mounting, enabling testing in natural postures while maintaining control through software synchronization.
Solution Approach 2:
The shutter system is designed to work with any mobile display device, making the solution universally applicable across different platforms and situations. The same shutter mechanism handles both far and near vision testing, as well as binocular and monocular testing modes, reducing overall system complexity despite the sophisticated control requirements.
3Measurement precision
If different frequencies and duty cycles are used for shutter activation, then image fusion and 3D perception are improved, but control system complexity increases
Solution Approach 1:
The control unit uses synchronization signals from the mobile display to coordinate shutter activation with image presentation. By monitoring the display's frame rate and timing, the control system adjusts shutter frequencies and duty cycles to optimize image fusion while maintaining synchronization with the visual stimulus, reducing the perceived complexity through adaptive coordination.
Data Source
AI summary
An optometric testing device comprising a first shutter and a second shutter placed in front of two eyes of a patient and configured to present an activated state in which a shutter blocks the propagation of light and a deactivated state in which the shutter allows the propagation of light, a communication unit configured to communicate with a display system in order to send and/or receive a synchronization signal, and a control unit configured to command each shutter as a function of the synchronization signal so that the first shutter and the second shutter change state with a first frequency and a second frequency, wherein the control unit is configured to command each shutter so that the first frequency is different from the second frequency and/or so that a duty cycle of activation of the first shutter is different from a duty cycle of activation of the second shutter.