Retinal Projection Head-Mounted Display for Visual Field Examination
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Solution Overview
Problem
Conventional visual field and visual acuity examination methods are time-consuming and require specialized equipment, such as a large housing and light-shielded spaces, and are limited by the need for maintaining a fixed distance between the test subject and visual targets.
Innovation Solution
A visual field/visual acuity examination system using a retinal projection head-mounted display with a Maxwellian view to project examination images directly onto the retina, allowing for easy and flexible testing without the need for a fixed distance or specialized spaces, and enabling the test subject to input results through a terminal device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional visual field examination methods using flashing light dots are used, then the examination can be conducted with simple equipment, but the examination time becomes excessively long and requires large housing and light-shielded spaces
Solution Approach 1:
The patent replaces the conventional mechanical/optical system of presenting flashing light dots in physical space with a computational approach using a terminal device display. The examination image is divided into multiple regions that are presented simultaneously on a screen, eliminating the need for physical light-shielded spaces and reducing examination time while maintaining measurement accuracy.
Solution Approach 2:
The patent transitions from a one-dimensional sequential presentation of visual targets (moving a flashing light dot through different positions) to a two-dimensional simultaneous presentation by dividing the examination image into multiple regions displayed at once on a terminal device screen. This dimensional change allows parallel processing of multiple visual field positions.
2Reliability
If conventional visual field examination requires large housing and light-shielded spaces, then the examination environment can be controlled, but the device size and space requirements increase
Solution Approach 1:
The patent creates a virtual copy of the visual field examination environment using a terminal device display instead of requiring a physical light-shielded space. The examination image is rendered on the screen, replicating the visual stimulus function without needing the bulky physical infrastructure of conventional devices.
Solution Approach 2:
The patent changes the fundamental parameter of how visual stimuli are delivered - from physical optical paths requiring light shielding to electronic display presentation. This parameter change allows the examination to be conducted in ordinary environments without specialized light-shielded spaces while maintaining measurement reliability.
3Measurement precision
If conventional visual acuity examination maintains fixed distance between test subject and visual target, then the examination can be standardized, but the examination setup becomes rigid and space-consuming
Solution Approach 1:
The patent makes the terminal device serve multiple functions - it acts as both the visual target presentation device and the result input device. The display screen presents the examination image while the terminal device's input interface (keyboard, touchscreen, etc.) collects the test subject's responses, eliminating the need for separate equipment and fixed positioning.
Solution Approach 2:
The patent replaces the static, fixed-distance setup with a dynamic system where the terminal device can be positioned flexibly. The examination image is presented on the terminal device screen at varying distances, and the system adapts to different positioning scenarios while maintaining measurement accuracy through the digital presentation format.
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 system allows for efficient and convenient visual field and visual acuity examinations, reducing testing time and eliminating the need for large equipment, while providing accurate results by projecting examination images directly onto the retina and allowing for easy input of results.
Implementation Method 1
a projection unit that scans an image light beam onto the retina so as to project a visual field examination image or a visual acuity examination image
Data Source
AI summary
A visual field/visual acuity examination system includes a retinal projection head-mounted display; and a terminal device. The terminal device outputs examination image data to the retinal projection head-mounted display; displays an image on a display; and generates an examination image based on the examination image data and display the examination image on the display. The retinal projection head-mounted display inputs the examination image data from the terminal device; generates an image light beam based on the input examination image data and control emission of the image light beam from a light source; causes a scanning minor to scan the image light beam to generate an examination image light beam; and projects the examination image light beam as the examination image on a retina of an eyeball of a test subject after converging the examination image light beam in a vicinity of a pupil of the eyeball.