Focus-Tunable Lens Visual Acuity Measurement in VR/AR Devices
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Solution Overview
Problem
Existing VR/AR devices do not effectively provide visual acuity correction for users with low visual acuity, necessitating the use of additional means like power clips, which are inconvenient.
Innovation Solution
An apparatus and method utilizing a focus-tunable lens with a display engine, image combiner, input device, storage, and processor to measure visual acuity by controlling optical powers in different lens regions, allowing for precise visual acuity determination through user input and electrode voltage application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a focus-tunable lens is used to provide VA correction function, then convenience is improved, but device complexity increases
Solution Approach 1:
The patent combines the VA correction function directly into the VR/AR device by integrating a focus-tunable lens within the optical system. This merging eliminates the need for separate power clips or external aids, allowing users to adjust focal distance conveniently while maintaining a unified device structure.
Solution Approach 2:
The focus-tunable lens enables dynamic adjustment of focal distance within the optical system, allowing the VR/AR device to adapt to different visual acuity requirements. This dynamic capability replaces static correction methods with an adjustable, responsive system that maintains convenience while managing complexity through controlled variability.
2Measurement precision
If multiple lens regions with different optical powers are assigned, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The lens surface is divided into multiple distinct lens regions, each assigned a different optical power value. This segmentation allows simultaneous presentation of multiple focal options across different regions, enabling precise visual acuity measurement by comparing user responses across segmented areas with varying optical properties.
Solution Approach 2:
Different regions of the lens are assigned different optical powers tailored to specific measurement needs. This local quality approach ensures that each region contributes uniquely to the measurement process, with specific optical powers optimized for detecting different visual acuity levels, thereby improving measurement precision through spatially differentiated optical characteristics.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables convenient and accurate visual acuity measurement and correction by dynamically adjusting lens powers, addressing the inconvenience of external aids and enhancing user experience in VR/AR devices.
Implementation Method 1
the focus-tunable lens may include a first strip electrode liquid crystal lens and a second strip electrode liquid crystal lens
Data Source
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AI summary
Provided are an apparatus and method for measuring a visual acuity (VA) by using a focus-tunable lens. The apparatus includes a display engine, an image combiner, a focus-tunable lens provided on a path of the light guided by the image combiner, an input device, and a processor configured to control the focus-tunable lens to assign different first and second optical powers to first and second lens regions, respectively, on a lens surface of the focus-tunable lens, control the display engine to display a VA measuring image through first and second output regions of the image combiner, control the input device to receive a user's input with respect to the VA measuring image, specify one optical power of the first and second optical powers based on the user's input, and determine a VA of a user based on the specified optical power.