Head-Mounted Vision Assessment With Bifocal Demand Control
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Solution Overview
Problem
Current systems for assessing and treating vergence and accommodation disorders are cumbersome, inaccurate, and imprecise, often requiring manual operation with human error and bulky, expensive automated systems, and fail to independently manipulate accommodative and vergence demands.
Innovation Solution
The use of bifocal or n-focal lenses with discrete zones of different dioptric powers in combination with head-mountable displays to assess and treat vergence and accommodation disorders, allowing independent manipulation of accommodative and vergence demands through systems that include eye tracking and calibration, and provide visual stimuli with specified vergence and accommodation requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual operation techniques are used for vision assessment, then ease of operation is improved, but measurement precision deteriorates due to human error
Solution Approach 1:
The system enables self-service through automated eye tracking and vergence/accommodation measurement without requiring manual operation by eye care professionals. The apparatus automatically captures eye movements, calculates vergence demands, and assesses accommodation ability, eliminating human error while maintaining ease of use through user-friendly interaction protocols
Solution Approach 2:
The patent replaces manual mechanical measurement systems with automated optical and computational systems. Eye tracking cameras, image processing algorithms, and computational models substitute for manual techniques, providing precise objective measurements of vergence and accommodation while maintaining operational simplicity
2Measurement precision
If automated systems are used for vision assessment, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The system achieves multi-functionality by using a single integrated apparatus that simultaneously performs eye tracking, vergence assessment, and accommodation measurement. The same hardware and software platform evaluates multiple vision parameters including phoria, convergence insufficiency, and accommodative amplitude, reducing overall system complexity compared to multiple separate devices
Solution Approach 2:
The patent employs parameter changes through dynamic adjustment of visual stimulus characteristics (size, distance, contrast) to elicit specific eye movement responses. By varying these parameters programmatically, the system achieves precise measurements without requiring complex physical apparatus, using computational algorithms to process changes in eye position and accommodation
3Ease of operation
If conventional assessment methods are used, then ease of operation is maintained, but productivity deteriorates due to time-consuming procedures
Solution Approach 1:
The system enables continuous automated measurement of vergence and accommodation through uninterrupted eye tracking. The apparatus continuously monitors eye movements and accommodation responses during visual tasks, eliminating the intermittent nature of manual testing and providing rapid, continuous data collection that significantly reduces assessment time while maintaining ease of operation
Solution Approach 2:
Automated image processing and computational algorithms replace time-consuming manual measurement procedures. The system automatically analyzes eye tracking data, calculates vergence demands, and determines accommodation ability through algorithmic processing, dramatically increasing productivity while keeping the interface simple and easy to operate
4Adaptability or versatility
If conventional systems are used, then adaptability is limited, but device complexity remains manageable
Solution Approach 1:
The system implements dynamic adaptability through programmable visual stimuli that can adjust parameters such as size, distance, contrast, and movement type based on user responses and accommodation status. The apparatus dynamically modifies test protocols in real-time to accommodate different patient populations and vision conditions, providing versatility without requiring complex hardware changes through software-based control
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 precise and efficient assessment and treatment of vergence and accommodation disorders by reducing human error, improving comfort, and providing accurate measurements of accommodative and vergence abilities in a cost-effective and time-efficient manner.
Implementation Method 1
bifocal or n-focal lenses with discrete zones of different dioptric powers
Implementation Method 2
providing visual stimuli with specified vergence and accommodation requirements
Implementation Method 3
systems that include eye tracking and calibration
Data Source
AI summary
Methods and systems for assessing and/or treating visual disorders, such as discorder in accommodative ability and/or vergence ability, of a person are provided. Assessment and training exercises can be performed utilizing a computerized system in communication with a head-mountable display (HMD), such as a virtual or augmented reality display, which can display visual targets at various vergence and accommodative demands. Lenses, such as inverted bifocal lenses, may be used in combination with the HMD to mimic natural accommodative demand during viewing or to enable assessment and treatment of accommodation disorders. Corrective factors can be calculated and utilized for generation of visual targets to account for lens characteristics and/or interpupillary distance mismatch. Accommodation and vergence responses can be tracked during display of the visual targets at the various demands, and assessed in comparison to normalized values for assessment of vision disorders or utilized to track progress of user in treatment of a vision disorder.