Prescription Optical Element for Head-Mounted Device
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Solution Overview
Problem
Users experience a transition period when switching between different pairs of eyeglasses, even if the optical power is the same, due to differences in lenses and frames such as eye-relief, interpupillary distance, frame tilt angle, refractive material, lens size, and residual aberrations.
Innovation Solution
A 3D optical-mechanical fit profile is generated using volumetric depth images captured by OCT systems, which are then used to fabricate prescription optical elements for head-mounted devices that match the distortion profile of the user's existing eyeglasses, reducing the transition time by ensuring compatibility and similar optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional eyeglasses with prescription lenses are used, then optical correction is provided, but transition period occurs when switching between different pairs
Solution Approach 1:
The patent applies parameter changes by systematically varying multiple optical and mechanical parameters (optical power, base curve, eye-relief, frame tilt angle, pantoscopic angle, vertex distance) to create a comprehensive distortion profile. This allows the HMD optical element to be tuned to match the user's specific eyeglass parameters, thereby reducing the transition period while maintaining consistent optical correction.
Solution Approach 2:
The patent creates a digital copy of the user's eyeglass optical system by capturing distortion profiles and optical-mechanical fit parameters. This copy is then used to design and fabricate the HMD optical element, ensuring it replicates the familiar optical characteristics of the user's conventional eyeglasses, thus minimizing adaptation time.
2Adaptability or versatility
If different lenses and frames are used in eyeglasses, then various optical performance characteristics are achieved, but distortion profile differences cause adaptation issues
Solution Approach 1:
The patent applies local quality by creating a customized optical element for each user's specific HMD device type (VR, AR, MR) with tailored distortion compensation. The distortion profile is locally optimized for each device category while maintaining overall system compatibility, allowing versatile optical performance adaptation without user discomfort.
3Adaptability or versatility
If head-mounted devices with standard optical elements are used, then device compatibility is achieved, but optical-mechanical fit differences cause distortion
Solution Approach 1:
The patent applies preliminary action by pre-characterizing different HMD optical element types (ballistic curvature, planar, aspheric) and their distortion characteristics before actual use. This pre-established knowledge base allows for rapid selection and customization of the appropriate optical element type for each user-device combination, achieving both compatibility and precision without extensive trial-and-error.
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
The solution significantly reduces the adaptation time for users switching between conventional eyeglasses and head-mounted devices by ensuring a precise optical and mechanical fit, minimizing distortion and aberrations, thereby enhancing user experience.
Implementation Method 1
an optical coherence tomography (OCT) device that may be utilized to capture volumetric depth images that include prescription lenses and the eyes of a wearer
Implementation Method 2
volumetric depth images that include prescription lenses and the eyes of a wearer of the prescription lenses
Data Source
AI summary
A distortion profile is based on user lens data and a selected optical-mechanical profile of a selected head mounted device. The user lens data is associated with prescription lenses worn by the user. A prescription optical layer is fabricated based on the distortion profile for the selected head mounted device.