Integrated AR Lens Layers for Multifocal Vision Correction
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Solution Overview
Problem
Existing augmented reality (AR) eyewear and prescription eyewear technologies struggle to provide simultaneous clear vision of both the real world and AR display, particularly for users with multifocal correction needs, such as those with presbyopia, without causing visual interference or requiring complex lens structures.
Innovation Solution
A lens specification is generated for a multilayer lens structure with specific parameters for display optics and eye/world side lens layers, incorporating multifocal correction components, distance shift components, and adjustments to optical power regions to optimize the presentation of AR content within the user's accommodation amplitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single uniform refractive lens correction is applied to both real world view and AR display, then the structure is simple, but users with multifocal correction needs (presbyopia) cannot achieve clear vision at multiple distances
Solution Approach 1:
The patent divides the lens into multiple lens layers, each with different refractive properties. The first lens layer provides distance vision correction while the second lens layer provides near vision correction, allowing presbyopic users to see both distant and near objects clearly through the same AR eyewear.
Solution Approach 2:
Different regions of the lens structure have different optical properties tailored to specific viewing distances. The lens layers have spatially varying refractive indices and curvatures optimized for their respective functions (distance vs. near vision), rather than using a uniform correction across the entire lens.
2Illumination intensity
If the AR display is presented at a close distance, then the display is visible, but presbyopic users require multifocal correction to see it clearly
Solution Approach 1:
The lens is segmented into multiple layers with the second lens layer specifically designed to correct near vision for the AR display. This segmentation allows the display to be presented at a close distance while presbyopic users can still focus on it clearly through the appropriate lens layer.
Solution Approach 2:
The multilayer lens structure serves multiple functions simultaneously: it corrects distance vision through the first lens layer, corrects near vision for the AR display through the second lens layer, and maintains overall structural integration as a single eyewear component.
3Manufacturing precision
If multifocal correction is implemented with multiple lens layers, then clear vision at multiple distances is achieved, but the lens structure becomes more complex
Solution Approach 1:
The patent combines multiple lens layers with different corrective functions into a single integrated lens structure that functions as one cohesive optical component. This merging approach achieves multifocal correction while maintaining a unified lens design that can be manufactured and worn as standard eyewear.
Solution Approach 2:
The lens layers are nested within each other, with the second lens layer positioned within or adjacent to the first lens layer. This nesting arrangement allows multiple corrective functions to be packed into a compact, manageable lens structure without excessive complexity.
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 ensures clear vision of both the real world and AR display by maintaining good visual acuity and accommodating multifocal corrections, optimizing the presentation of AR content within the user's effective accommodation range.
Implementation Method 1
A lens specification is generated for a multilayer lens structure... incorporating multifocal correction components, distance shift components, and adjustments to optical power regions
Data Source
AI summary
A lens specification for multiple lens layers of a lens structure is generated by one or more processors. A multifocal correction (MFC) component is assigned to at least one lens layer of the multiple lens layers. Parameters are generated for a display optics (DO) lens layer comprising an augmented reality (AR) display, the DO lens layer having a first side for facing an eye of the user and a second side for facing away from the eye of the user. Parameters are generated for one or more eye side (ES) lens layers of the multiple lens layers to be disposed adjacent to the first side of the DO lens layer, and for one or more world side (WS) lens layers to be disposed adjacent to the second side of the DO lens layer. The generated lens specification is provided for use in production of the lens structure for the user.