Eyesight Examination Device Using Segmented Geometric Optotypes

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Solution Overview

Problem

Conventional eyesight examination methods are inadequate for accurately assessing vision in individuals with astigmatism and fail to provide intuitive and universal optotype identification, leading to inconsistent and inaccurate results across different users and age groups.

Innovation Solution

The method positions reference images outside optotype images in different directions, allowing users to select a response based on shape matching, with reference images being equal in size or larger than the optotype images, enabling accurate and intuitive selection regardless of eye refraction or age, and using various optotypes for automated examination.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Extent of automation

If Landolt optotypes or line figures are used for automated eyesight examination, then automation is achieved, but subjects with astigmatism have difficulty specifying correct direction leading to inaccurate examination

Engineering Contradiction:

Improveautomated eyesight examinationVSAvoidexamination accuracy for subjects with astigmatism

Core Design Contradiction:

Extent of automationVSMeasurement precision

Solution Approach 1:

The optotype is segmented into multiple component parts (e.g., lines forming a square, circles, triangles, or other geometric shapes). Instead of presenting a complete optotype that requires directional interpretation, the system presents separated components that subjects can identify and locate without needing to determine orientation, thereby eliminating the astigmatism-related directional confusion while maintaining automated examination capability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The conventional approach presents complete optotypes requiring directional identification, which fails for astigmatic subjects. The invention inverts this approach by presenting segmented components instead of complete forms, and by having subjects identify component locations rather than optotype directions, thus solving the measurement precision problem while preserving automation

Inventive Principle:

Principle #13The other way round (Inversion)

2Adaptability or versatility

If various types of optotypes (numbers, letters, Landolt rings, ships, airplanes, umbrellas, animal patterns) are used to carry out accurate examination, then examination versatility is improved, but accurate optotype identification by subject becomes more difficult requiring complex configuration

Engineering Contradiction:

Improveexamination versatility with various optotypesVSAvoidconfiguration complexity for accurate optotype identification

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The system uses geometric shape components (lines, circles, triangles, squares) that can form multiple different optotype configurations (ships, airplanes, umbrellas, animal patterns, letters, numbers). These universal geometric elements serve multiple functions: they are easily identifiable by subjects of all ages, can be arranged to create various optotype types, and maintain simple configuration requirements while achieving examination versatility across different visual acuity levels and age groups

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system changes parameters such as the arrangement, number, and configuration of geometric components to create different optotype types. By varying these parameters (e.g., positioning lines to form different shapes, changing the number of components), the system achieves versatility in examination types while maintaining the simplicity of geometric shape identification and avoiding complex configuration requirements

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If conventional optotypes require subjects to specify directions or identify complex shapes, then examination coverage is limited, but intuitive identification by subjects of all ages without further explanation becomes difficult

Engineering Contradiction:

Improveexamination coverage across different age groupsVSAvoidintuitive identification without further explanation

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The system uses simple geometric shapes (lines, circles, triangles, squares) as local components that have inherent visual simplicity and universality. These basic geometric forms are intuitively recognizable by subjects of all ages without requiring explanation, and their arrangement into larger optotype configurations maintains this intuitive quality while enabling comprehensive examination coverage across different visual acuity levels and age groups

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP3434172B1Eyesight examination method, eyesight examination device, and downloader server for storing program of eyesight examination method

Publication Date: 2022.08.24 VIEWMTECH

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AI summary

The present invention relates to an eyesight examination method, an eyesight examination device, and a downloader server for storing a program of the eyesight examination method, the eyesight examination method comprising the steps of: displaying an optotype image and a plurality of reference images; receiving a response to the optotype image; and determining whether a reference image determined on the basis of the response from among the plurality of reference images has the same shape as the optotype image, wherein one of the plurality of reference images has the same shape as the optotype image.