Online Vision Testing Using Web-Based Astigmatism Charts
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Solution Overview
Problem
Current online vision testing methods are inadequate for remotely disposed individuals, as they require on-site visits to obtain visual acuity, cylinder, and axis values necessary for prescriptive glasses, limiting the adoption of online shopping for custom eyeglasses.
Innovation Solution
A novel online vision testing method that establishes a communicative connection between a host computing system and a client device, using Web content to present acuity, astigmatism clock, and fan charts for user selections, allowing for the derivation of visual acuity, cylinder, and axis values, enabling remote prescription determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If online vision testing is implemented, then accessibility and convenience for remote customers are improved, but measurement precision and reliability of prescription values deteriorate
Solution Approach 1:
The vision testing process is divided into multiple sequential stages: initial acuity test with Snellen chart, followed by astigmatism detection using clock diagram, then refined axis measurement with fan diagram, and finally cylinder power determination. This segmentation allows complex prescription measurement to be broken down into manageable online steps, maintaining accuracy while improving accessibility.
Solution Approach 2:
The system performs preliminary vision screening and acuity assessment online before proceeding to more detailed astigmatism and axis measurements. This preliminary action filters users and prepares them for subsequent specialized tests, ensuring that only those who need comprehensive online testing proceed, thereby maintaining measurement precision while improving overall accessibility.
2Extent of automation
If comprehensive vision testing (acuity, cylinder, axis) is conducted online, then independence from sales associates is improved, but device complexity and test procedure complexity increase
Solution Approach 1:
The web-based testing system serves multiple functions: it performs Snellen acuity testing, clock diagram astigmatism detection, fan diagram axis measurement, and cylinder power determination all through a single unified platform. This multi-functionality reduces the need for multiple separate devices or systems, managing complexity while enabling complete independent vision testing.
Solution Approach 2:
The system uses standardized visual test charts (Snellen chart, clock diagram, fan diagram) as intermediaries between the user's vision and the computational analysis. These standardized intermediaries simplify the interaction complexity by providing consistent, interpretable visual patterns that can be automatically analyzed, reducing the perceived complexity for the user while maintaining measurement accuracy.
3Loss of information
If multiple test charts (acuity, clock, fan) are presented, then completeness of prescription information is improved, but time required for testing and user patience increase
Solution Approach 1:
The testing system presents multiple test charts in a periodic, structured sequence: first the Snellen acuity chart, then the clock diagram for astigmatism, followed by the fan diagram for axis refinement, and finally cylinder power determination. This periodic structure allows the user to progress through different aspects of vision testing in manageable intervals, reducing overall time commitment while ensuring complete prescription information is gathered.
Solution Approach 2:
The system dynamically adapts the testing sequence and complexity based on user responses. If initial acuity testing indicates no significant vision issues, the system can shorten or skip certain astigmatism and axis refinement steps. This dynamic adjustment optimizes testing duration while maintaining completeness of prescription data for those who need it.
Data Source
AI summary
A selection for an acuity test chart is received in distributed Web content that correlates to a distance between an end user and a display of the test chart. A selection also is received of a trio of lines of different widths in a set of lines defining one of twelve radially equidistant radii of equal length extending from a common vertex in an astigmatism clock chart. An astigmatism fan chart also is generated and presented in the Web content utilizing three of the trio of lines in the selection and including twelve repeating sequences of three radially equidistant radii of different widths corresponding to the different widths of the utilized three of the trio of lines. One of the radii is selected and a prescription computed including the visual acuity value, a cylinder value deriving from the selected trio, and an axis value deriving from the selected radii.