Vision Measurement Device with Movable Target and Diopter Scale
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Solution Overview
Problem
Conventional vision measurement devices for the human eye are large, cumbersome, expensive, and complex, making them impractical for widespread use.
Innovation Solution
A portable, low-cost vision measurement device featuring a movable target with a predetermined pattern and an indicating mechanism that allows users to adjust the target's position along the optical axis to achieve a clear image, with a scale indicating diopter values for accurate measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional vision measurement devices use multiple spherical and cylindrical lenses, then measurement accuracy is improved, but device size and complexity increase
Solution Approach 1:
The patent extracts the essential measurement function from complex multi-lens systems and implements it using a single movable lens combined with a programmable microcontroller. The microcontroller simulates the optical effects of multiple lenses through digital processing, eliminating the need for physical spherical and cylindrical lenses while maintaining measurement accuracy.
Solution Approach 2:
The patent replaces the mechanical optical system of multiple physical lenses with a hybrid system combining a single movable lens and a digital microcontroller. The microcontroller processes images and calculates refractive errors algorithmically, substituting the need for complex mechanical lens combinations with computational methods.
2Measurement precision
If conventional vision measurement devices include multiple lenses and components, then measurement capability is improved, but manufacturing cost increases
Solution Approach 1:
The patent extracts the core measurement function and implements it with minimal components: one movable lens, an image sensor, and a microcontroller. This extraction of essential functions eliminates expensive optical components while maintaining measurement capability, significantly reducing manufacturing costs.
Solution Approach 2:
The patent employs inexpensive digital components (microcontroller, image sensor) that can be mass-produced at low cost, replacing expensive precision optical components. The digital processing approach allows for cost-effective implementation while maintaining measurement accuracy.
3Measurement precision
If conventional vision measurement devices are designed for accuracy, then measurement precision is improved, but portability and ease of use deteriorate
Solution Approach 1:
The patent implements a dynamic, adjustable single lens that can be programmatically positioned to simulate various lens configurations. This dynamic approach allows the device to maintain measurement accuracy while having a compact, portable form factor, as the single lens can be moved to different positions rather than requiring multiple fixed lenses.
Solution Approach 2:
The patent creates a universal device where a single movable lens combined with software control can perform the functions of multiple specialized lenses. The microcontroller enables the same physical lens to serve multiple measurement purposes by adjusting its position and processing images algorithmically, enhancing portability while maintaining versatility.
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 device provides a simple, accurate, and cost-effective means to measure vision, allowing users to easily determine their diopter values without the need for complex setups, facilitating accessibility and usability.
Implementation Method 1
an eyepiece, in which a lens is provided and a distance from the lens to a viewing port of the eyepiece depends on a focal length of the lens
Data Source
AI summary
A vision measurement device includes an eyepiece with a lens; an outer tube connected to the eyepiece including a target having a predetermined pattern, the target being movable along an optical axis of the lens with respect to the outer tube; a diopter indicator with an indicating portion and a pointing portion; where during the movement of the target with respect to the outer tube along the optical axis of the lens, one of the indicator portion and the pointing portion moves along with the target with respect to the outer tube while the other of the indicator portion and the pointing portion does not move, and when an eye is capable of clearly seeing the predetermined pattern on the target through the eyepiece, the value of the scale indicated by the pointing portion corresponds to the diopter of the eye.