HMD Vision Correction via Optical Parameter Measurement
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Solution Overview
Problem
Existing head-mounted display (HMD) systems face challenges in accommodating corrective lenses for users with vision deficiencies, particularly in providing comfortable and precise adjustments for myopia, hyperopia, and astigmatism, while also complicating eye and face tracking.
Innovation Solution
A system that uses a user device with an imaging device and controller to capture images of a test pattern through and without the corrective lenses, determining optical parameters such as optical power and inter-pupillary distance, allowing users to select appropriate corrective inserts or adjust HMD settings for accurate vision correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a head-mounted display includes a mechanical design to allow users to wear their correction lenses inside the HMD, then users can maintain their vision correction, but the HMD volume increases and comfort decreases
Solution Approach 1:
The patent extracts the corrective lens function from the physical eyewear device and implements it through software-based optical parameter adjustments in the HMD system. The imaging device captures images through the user's existing lenses to determine optical parameters, which are then used to configure the HMD's display and imaging systems, eliminating the need to physically incorporate external lenses into the HMD structure.
Solution Approach 2:
The patent creates an optical model that replicates the effect of the user's corrective lenses through software algorithms. By capturing images through the physical lenses and analyzing them to determine optical parameters (power, astigmatism, PD), the system creates a digital representation of the lens properties that can be applied in the HMD's optical system, avoiding the need for physical lens integration.
2Adaptability or versatility
If a head-mounted display includes a focus mechanism to allow the user to adjust a position of a lens, then correction for myopia and hyperopia is enabled, but correction for astigmatism is not enabled and precision is reduced
Solution Approach 1:
The patent implements a feedback mechanism where the imaging device captures images through the user's corrective lenses, and the system analyzes these images to automatically determine the optical parameters including sphere, cylinder, axis, and pupillary distance. This feedback loop eliminates manual adjustment errors and provides precise measurement of all vision correction parameters, including astigmatism, without requiring complex mechanical adjustment mechanisms.
Solution Approach 2:
The patent replaces mechanical focus adjustment mechanisms with an optical measurement and software-based correction system. Instead of relying on manual lens position adjustments, the system uses an imaging device to capture and analyze images through the user's lenses, automatically determining the precise optical parameters needed for correction, including astigmatism which cannot be corrected through simple focus adjustment alone.
3Ease of operation
If a head-mounted display includes corrective lenses as a corrective insert, then user comfort increases and vision correction is provided, but the user does not know how to select an appropriate corrective insert
Solution Approach 1:
The patent enables the system to automatically perform the function of selecting appropriate corrective parameters by capturing images through the user's existing lenses and analyzing them to determine the correct optical properties. The HMD system self-configures based on the measured parameters from the imaging device, eliminating the need for users to manually select or understand corrective insert specifications.
Solution Approach 2:
The patent performs preliminary measurement and analysis of the user's corrective lenses before the user needs to use the HMD. By capturing images through the lenses during an initial setup phase and determining the optical parameters in advance, the system prepares the correct correction settings beforehand, so users can simply use the HMD without needing to understand or select corrective parameters themselves.
4Reliability
If users manually adjust corrective lens settings in an HMD system, then vision correction is provided, but the adjustments may not be precise and user experience is negatively impacted
Solution Approach 1:
The patent implements an automated feedback-based measurement system where the imaging device captures images through the user's corrective lenses and the system automatically analyzes these images to determine the precise optical parameters. This feedback mechanism replaces manual user adjustment with an objective, measurement-based approach that ensures high precision in determining sphere, cylinder, axis, and pupillary distance values.
Solution Approach 2:
The patent replaces manual mechanical adjustment mechanisms with an automated optical measurement system. The imaging device and image analysis algorithms substitute for manual user adjustment, providing precise and repeatable measurements of the user's vision correction parameters without the variability and imprecision inherent in manual adjustment processes.
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 users to accurately determine and adjust their corrective lens settings within HMD systems, improving user experience by providing precise vision correction and comfort, while simplifying the integration of corrective lenses in HMDs.
Implementation Method 1
An imaging device (e.g., camera of smartphone, tablet, etc.) of the user device captures one or more images of the test pattern through the one or both prescription lenses of the eyewear device
Data Source
AI summary
A user device comprises an imaging device and a controller. The imaging device captures one or more images of a test pattern presented by a display surface through a lens of eyewear device and the test pattern not through the lens in accordance with imagining instructions from the controller. The controller generates imaging instructions and provides the imaging instructions to the imaging device. The controller determines one or more optical parameters of the eyewear device based on the captured one or more images of the test pattern as seen through the lens and the test pattern not seen through the lens. The optical parameters may include an optical power of the lens or an inter-pupillary distance of the eyewear device.