Refractive Error Determination Using Screen Spatial Frequency
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Solution Overview
Problem
Existing methods for determining refractive errors in users' eyes often require specialized devices and professional assistance, limiting accessibility and convenience.
Innovation Solution
A method using a mobile communication device to display a periodic pattern on a screen, where the user's reaction to changes in the pattern's spatial frequency is measured to determine the refractive error, allowing for a subjective and device-independent assessment of refractive errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional refraction determination methods are used, then measurement precision is improved, but device complexity increases and requires specialized equipment
Solution Approach 1:
The patent uses a display screen to present visual stimuli that replicate the function of traditional refraction testing equipment. The display device creates virtual optotypes and patterns that serve as substitutes for physical testing apparatus, enabling refraction assessment through software-based presentation of visual content rather than specialized optical equipment
Solution Approach 2:
The invention replaces mechanical and optical testing equipment with an electronic display system and computer processing. The refraction determination is achieved through software algorithms that analyze user responses to displayed patterns, substituting physical refraction testing machinery with computational methods and visual display technology
2Measurement precision
If professional assistance is required for refraction determination, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent enables users to perform their own refraction assessment through a self-administered testing process. The system presents visual stimuli on a display and captures user responses through input devices, allowing individuals to determine their refractive status without requiring optometrists or specialized testing personnel to conduct the examination
Solution Approach 2:
The computing device serves as an intermediary between the user and the refraction assessment process. It automatically presents visual stimuli, records responses, processes the data through algorithms, and generates refraction determination results, eliminating the need for professional mediators while maintaining measurement through structured interaction
3Measurement precision
If specialized equipment is used for refraction determination, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent utilizes a display device and computing system that can perform multiple functions including presenting various visual stimuli, capturing user responses, processing data, and determining refraction values. This multi-functional approach replaces multiple specialized refraction testing devices with a single universal computing platform that handles the entire assessment workflow
Solution Approach 2:
The invention combines the functions of stimulus presentation, response recording, data processing, and refraction calculation into a single integrated system. The display screen, input device, and computing algorithms work together as unified components, merging what would traditionally require separate specialized equipment into one cohesive device
Data Source
Figure 1~2
AI summary
The present invention relates to a method (210), a device (110), and a computer programme for determining a refractive error of at least one eye (112) of a user (114), and to a method for manufacturing a spectacle lens for the at least one eye (112) of the user (114). The method (210) for determining the refractive error of the at least one eye (112) of the user (114) comprises the following steps: a) displaying at least one character (122) on a screen (120), wherein the at least one character (122) displayed on the screen (120) is at least one periodic pattern (124), wherein at least one parameter of the at least one pattern (124) displayed on the screen (120) comprises at least one spatial frequency, wherein the at least one parameter of the at least one character (122) displayed on the screen (120) is varied; b) detecting a reaction of the user (114) depending on the at least one character (122) displayed on the screen (120); and c) determining a point in time at which the reaction of the user (114) results in the user (114) being able to perceive the at least one character (122) displayed on the screen (120); d) determining a value (220) for the refractive error of the at least one eye (112) of the user (114) from the at least one parameter determined at the point in time, wherein the value (220) for the refractive error is determined from the at least one spatial frequency, determined at the point in time, of the at least one pattern (124).