Blur-Matched Visual Objects for Reliable Vision Testing
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Solution Overview
Problem
Conventional optotypes are difficult to recognize with optically induced blur, leading to inaccurate determination of visual properties due to the test person's inability to assign blurred optotypes to easily identifiable objects, and existing methods fail to provide a simple, reliable, and fast assessment of visual functions.
Innovation Solution
A visual object comprising at least two different filtered images, each representing a predetermined original image with a filter specific to a predetermined optically induced blur, allowing for the presentation of test images that enhance recognition based on individual or average aberrations, thereby facilitating clearer and faster identification of specific original images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional optotypes are used for visual acuity testing, then the test can be performed with simple equipment, but the test person cannot reliably recognize the optotypes when optically induced blur is present
Solution Approach 1:
The patent applies preliminary action by pre-filtering the optotype images with blur filters that match expected optical aberrations before presenting them to the test person. This allows the test person to recognize the optotypes even when viewing through an uncorrected eye, because the blurred version is presented as the original stimulus rather than as a degraded version of a sharp stimulus.
Solution Approach 2:
The patent changes the parameter of the optotype presentation by transforming the original image into a filtered version that matches the optical conditions. The filter function modifies the spatial frequency content of the optotype to compensate for the expected blur, effectively changing the image parameters to suit the degraded viewing conditions.
2Productivity
If conventional optotypes are used, then the testing procedure is simple, but the determination of visual properties takes a long time due to difficulty in classification
Solution Approach 1:
By pre-filtering the optotypes to match expected blur conditions, the patent enables faster recognition and classification. The test person does not need to mentally deblur or interpret distorted features, but can directly recognize the filtered optotype form, reducing the time needed for each trial.
3Measurement precision
If optotypes are presented with optically induced blur, then the test can assess visual function under realistic conditions, but the test person cannot assign the blurred optotype to an easily identifiable object
Solution Approach 1:
The patent transforms the optotype presentation by applying blur filters that match the optical conditions to the original images before displaying them. This parameter change ensures that the presented image already reflects the expected degradation, allowing the test person to identify it as a recognizable object form rather than trying to reconstruct a sharp image from blurred features.
Data Source
AI summary
A visual object for determining one or more visual properties of a test person. The visual object includes at least two different filtered images combined to form a test image, wherein each of the filtered images represents one of at least two predetermined different original images and is provided with a filter specific to a predetermined optically induced blur.