Handheld Autorefractive Device Using Micro Lens Array for Accurate Refraction
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Solution Overview
Problem
Conventional autorefractive devices for determining refractive parameters and visual acuity require professional intervention and are often expensive and bulky, limiting their accessibility and usability.
Innovation Solution
A handheld portable autorefractive device that uses a combination of a viewing unit with an obstacle to split light patterns and a micro array to detect refractive parameters, allowing for user-provided feedback to adjust the device's settings for accurate measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional autorefractive devices are used to determine refractive parameters, then measurement accuracy is achieved, but device complexity and cost increase
Solution Approach 1:
The device is divided into distinct functional modules: a light source unit, a diffraction grating, a micro lens array, and a detector array. Each module performs a specific function in the refraction measurement process, allowing for simplified design and manufacturing while maintaining measurement accuracy through coordinated operation of these segmented components
Solution Approach 2:
The patent uses a micro lens array that creates multiple copies of the light pattern from different angles. This copying mechanism allows the detector to capture refraction information from various directions simultaneously, enabling accurate refractive parameter measurement without requiring complex mechanical scanning systems
2Measurement precision
If conventional autorefractive devices are used, then refractive parameter detection is achieved, but portability is reduced
Solution Approach 1:
The patent replaces traditional mechanical optical systems with a stationary micro lens array and detector array configuration. This eliminates the need for heavy mechanical scanning components and moving parts, significantly reducing device weight while maintaining the ability to measure refractive parameters accurately through the fixed optical path design
3Measurement precision
If professional intervention is required for refraction measurement, then measurement accuracy is maintained, but ease of operation decreases
Solution Approach 1:
The device incorporates an automated measurement system where the micro lens array and detector array work together to automatically capture and process refraction data. The system performs multiple measurements and calculations without requiring professional intervention, enabling users to conduct refraction tests independently while maintaining measurement accuracy through built-in computational algorithms
Solution Approach 2:
The patent implements a feedback mechanism where the detector array receives light patterns from the micro lens array, processes the signals, and provides real-time measurement data. This automated feedback loop allows the device to self-correct and refine measurements without professional guidance, simplifying operation for end users
4Measurement precision
If conventional autorefractive devices are used, then comprehensive refraction analysis is achieved, but cost increases
Solution Approach 1:
The patent achieves accurate refraction measurement by varying the focal length of the micro lens array elements and analyzing the resulting light patterns at different positions on the detector array. This parameter-based approach uses simple, inexpensive optical components rather than complex expensive equipment, reducing manufacturing costs while maintaining measurement precision
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 accurate detection of refractive parameters and visual acuity without professional intervention, making it portable, cost-effective, and simple to use, while also providing data for further analysis.
Implementation Method 1
a viewing unit, the screen being viewable through the viewing unit, the viewing unit including an obstacle, the obstacle being to split the initial pattern displayed on the screen as visible to the user, to emulate a principle of diffraction of light
Data Source
AI summary
Methods and devices for detecting refraction parameter involve an initial pattern displayed on a screen of a first detection unit of a handheld portable autorefractive device for a user to view through a viewing unit. In response to the initial pattern displayed on the screen, the refractive parameter and visual acuity of the eye of the user are detected based on feedback provided by the user or may be detected automatically by the autorefractive device. The refractive parameter value and vision acuity value detected are displayed on a display screen of the autorefractive device.