Optometry Device Transparent Scene Zone Contrast
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Solution Overview
Problem
Existing optometry devices face challenges in delivering reliable and precise subjective refraction measurements due to low contrast between visual test images and scene images, leading to inconsistent results compared to standard devices.
Innovation Solution
The optometry device incorporates a control unit that defines a transparent scene zone within the superimposition area, adjusting luminance and colorimetry to maintain contrast, with features like fuzzy peripheral zones, adjustable size and position of the transparent zone, and varying luminance levels to enhance visibility of the visual test image without decreasing contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the visual test image is superimposed with the scene image, then the individual can observe both images simultaneously, but the contrast of the visual test image decreases
Solution Approach 1:
The scene image is modified to have different transparency characteristics in different regions. Specifically, a first zone is created with reduced transparency (higher opacity) to maintain contrast for visual test images displayed in that region, while a second zone maintains normal transparency to allow viewing of the scene image. This local differentiation of transparency properties resolves the contradiction by allowing both functions to coexist in different spatial regions.
Solution Approach 2:
The display area is segmented into multiple zones with different transparency characteristics. The scene image is divided into at least two distinct zones: a first zone with reduced transparency and a second zone with normal transparency. This segmentation allows the system to provide different viewing experiences in different regions, maintaining both the ability to observe the scene and the contrast of visual test images simultaneously.
2Measurement precision
If the scene image transparency is reduced in the first zone, then the contrast of visual test images is maintained, but the visibility of the scene image decreases in that zone
Solution Approach 1:
The scene image display area is segmented into multiple zones with different transparency properties. The first zone has reduced transparency to maintain visual test image contrast, while the second zone maintains normal transparency for scene visibility. This segmentation allows the system to accept the trade-off of reduced scene visibility in the first zone while maintaining measurement precision through preserved contrast in that same zone.
Solution Approach 2:
Different regions of the scene image are assigned different transparency qualities based on their intended function. The first zone is assigned reduced transparency quality to prioritize visual test image contrast, while the second zone is assigned normal transparency quality to prioritize scene image visibility. This local quality differentiation resolves the contradiction by allowing each zone to optimize for its primary function.
3Measurement precision
If a transparent zone is defined in the scene picture, then the visual test image can be observed without contrast decrease, but the device complexity increases
Solution Approach 1:
The control unit modifies the transparency parameter of the scene image in specific zones rather than changing the physical structure of the device. By dynamically adjusting the transparency parameter of digital image data, the system achieves the desired contrast maintenance without adding complex mechanical or optical components. This parameter-based approach resolves the contradiction by implementing the solution through software control rather than hardware complexity.
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 configuration allows for improved contrast and reliability of visual test images, enabling more accurate subjective refraction measurements comparable to standard devices by maintaining image clarity and consistency across different visual test distances.
Implementation Method 1
a projection optical system adapted to produce from a scene picture and from a visual test picture including a functional zone, respectively: a scene image produced along a scene optical path of said projection optical system at a scene distance from the individual's eye; and a visual test image produced along a visual test optical path of said projection optical system at a visual test distance from the individual's eye
Data Source
AI summary
An optometry device for testing an individual's eye, including a refraction test unit having a vision correction optical system for providing different vision correction power values, and a display unit comprising a control unit controlling a projection optical system adapted to produce from a scene picture and from a visual test picture including a functional zone, respectively, along a scene optical path of the projection optical system, a scene image at a scene distance from the individual's eye, and along a visual test optical path of the projection optical system, a visual test image at a visual test distance from the individual's eye smaller than or equal to the scene distance of projection, the visual test image being superimposed at least partially with the scene image.