Visual Acuity Exam Optics With Camera-Based Distance Adjustment
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Solution Overview
Problem
Existing eye examination systems for visual acuity are cumbersome and inconvenient for users, often requiring physical structures to maintain a fixed distance from the display, which can lead to inaccurate results if not properly positioned.
Innovation Solution
A system utilizing an optical subsystem with a depth estimation algorithm to determine the distance between the subsystem and a display, incorporating a handheld or head-worn device with a fixed-size visual indicator and vision modifiers, along with a camera and processor, to ensure accurate eye examinations by adjusting the visual stimulus size based on the detected distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If physical structures are used to maintain fixed distance from the display, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces mechanical distance-maintaining structures with a camera-based depth estimation system that uses visual indicators and image processing to automatically determine distance, eliminating the need for physical positioning structures
Solution Approach 2:
The system performs self-measurement by using its own camera to detect the visual indicator and calculate distance automatically, without requiring external measurement tools or manual positioning assistance
2Measurement precision
If fixed distance positioning is required, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The system transitions from static fixed-distance positioning to dynamic distance adaptation, where the display automatically adjusts based on real-time depth estimation from the camera, allowing users to position themselves naturally without strict positioning requirements
Solution Approach 2:
The system continuously monitors distance through camera-based depth estimation and provides feedback by adjusting the visual stimulus size accordingly, creating a closed-loop system that maintains measurement accuracy across varying distances
3Measurement precision
If visual stimulus size is adjusted based on distance, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system dynamically changes the visual stimulus size parameter based on detected distance, allowing the same device to accurately test visual acuity at multiple distances without hardware modifications
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 self-administer eye examinations with reduced inconvenience by ensuring accurate positioning and results through dynamic adjustment of visual stimuli based on the detected distance, allowing for convenient and precise visual acuity testing.
Implementation Method 1
The distance may be determined based on comparing the fixed size of the visual indicator to a detected size of the visual indicator in an image obtained by the camera
Data Source
AI summary
Systems, devices, and methods for conducting an eye examination for visual acuity are provided. In one example, a system may include an optical subsystem positioned in front of one or both eyes of a user. The optical subsystem may comprise a handheld device or a head worn device, a visual indicator, and a plurality of vision modifiers. The system may determine a distance between the optical subsystem and the display based on comparing a fixed size of the visual indicator to a detected size of the visual indicator in an image obtained by a camera. The system may output an eye examination image for visual acuity based on the distance being within a valid range. The eye examination image may include a visual stimulus having an output size determined based on the distance. The system may receive an input from the user indicating a selection of the visual stimulus.