Smartphone Near Vision ADDITION Measurement via Eye Tracking
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Solution Overview
Problem
In regions with limited eye care resources, professionals face challenges in accurately measuring and computing the visual correction need for near vision, particularly the ADDITION, which is essential for bifocal and progressive lenses, leading to inadequate correction and visual discomfort.
Innovation Solution
A method using a smartphone or electronic device with a display screen, mapping sensor, and input interface to determine the visual correction need by measuring the limit distance at which an individual can recognize predetermined symbols, employing sensors like ultrasonic, optical, or 3D cameras, and computation circuits to calculate the ADDITION for near vision correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sophisticated equipment is used to measure visual correction need, then measurement precision is improved, but device complexity increases and cost increases
Solution Approach 1:
The patent uses a smartphone camera to capture images of the individual's eye and uses image processing algorithms to analyze the eye's optical properties. This replaces sophisticated optical measurement equipment with a common portable device, achieving accurate measurement of visual correction needs through computational photography and image analysis
Solution Approach 2:
The patent replaces mechanical optical measurement systems with a digital imaging system using a smartphone camera. The measurement is achieved through capturing images and processing them computationally rather than using complex mechanical optical benches and specialized ophthalmic equipment
2Measurement precision
If complex measurement methods are used to determine ADDITION, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent enables individuals to perform their own vision measurement using a smartphone. The system guides the individual through the measurement process automatically, capturing eye images and computing the ADDITION value without requiring professional ophthalmologist intervention, thus simplifying operation while maintaining precision
Solution Approach 2:
The patent pre-programs the smartphone with algorithms and measurement protocols necessary to determine visual correction needs. The device is prepared in advance with all necessary computational tools, allowing the individual to simply follow instructions and obtain accurate measurements without needing to understand the complex measurement principles
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
This method provides accurate and simple determination of near vision correction needs, enabling individuals to assess and order glasses with precise ADDITION values, improving visual comfort and reducing errors associated with existing complex measurement techniques.
Implementation Method 1
a portable medium displaying said at least one predetermined symbol is displaced in front of the face and eyes of the individual to change a frontal distance between his/her eyes and the portable medium
Data Source
AI summary
The invention is related to a measurement method for determining a value of a visual correction need for near vision of an individual in a natural posture for near vision wherein a recognizing limit distance is determined so that the individual is able to recognize at least one predetermined symbol disposed farther than said limit distance relatively to the individual and unable to recognize said at least one predetermined symbol disposed closer to the individual than said limit distance, wherein a portable medium displaying said at least one predetermined symbol is displaced in front of the face and eyes of the individual to change a frontal distance between his/her eyes and the portable medium and in which when a recognizing limit distance is detected by the individual, said limit distance is measured and the value of the visual correction need is determined from said measured limit distance, wherein said visual correction need comprises an accommodation compensation need.