Cone Photoreceptor Sensitivity Test Using Maxwellian View
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for determining cone photoreceptor pathway function are cumbersome, time-consuming, and lack specificity and sensitivity, making it difficult to diagnose diseases such as glaucoma and other conditions affecting the macula and central vision in a clinical setting.
Innovation Solution
A method and apparatus that measure cone photoreceptor sensitivity using a Maxwellian view optical system with a flashing stimulus and a steady background, allowing for quick and accurate assessment of cone photoreceptor function, particularly in the fovea, to identify impaired function and risk for diseases like glaucoma.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods for determining cone photoreceptor pathway function are used, then diagnostic capability is provided, but the methods are cumbersome and time-consuming to administer
Solution Approach 1:
The visual field is segmented into specific test locations (e.g., 10-2 pattern with 69 test points) that systematically cover the central vision area. This segmentation allows comprehensive diagnostic coverage while streamlining the testing process through standardized location-based assessment.
Solution Approach 2:
The method employs variable stimulus parameters including different luminances, chromaticities, and flash durations adapted to each test location. By optimizing these parameters for specific retinal regions, the test achieves high diagnostic sensitivity while maintaining efficient administration through automated parameter selection.
2Reliability
If conventional methods for determining cone photoreceptor pathway function are used, then diagnostic capability is provided, but the methods lack specificity and sensitivity
Solution Approach 1:
The test delivers location-specific stimuli with optimized luminance and chromaticity values tailored to each test point's retinal location. This local quality approach ensures maximum sensitivity for detecting cone photoreceptor dysfunction at each specific location while maintaining overall diagnostic specificity through comprehensive spatial sampling.
Solution Approach 2:
The method incorporates adaptive feedback mechanisms where stimulus parameters are adjusted based on subject responses and predetermined thresholds. This feedback loop enhances measurement precision by dynamically optimizing stimulus presentation to elicit reliable cone photoreceptor responses while maintaining high diagnostic specificity.
3Reliability
If conventional methods for determining cone photoreceptor pathway function are used, then diagnostic capability is provided, but the burden on subject and healthcare provider is increased
Solution Approach 1:
The automated testing system performs stimulus presentation, response recording, and threshold determination with minimal operator intervention. This self-service capability reduces the burden on healthcare providers while maintaining diagnostic reliability through standardized, reproducible testing protocols that require minimal training.
Solution Approach 2:
The test employs periodic flash stimuli presented at optimized intervals to assess cone photoreceptor function. This periodic action structure provides clear, repetitive response opportunities for subjects while streamlining data collection and analysis, thereby reducing operational burden on both subjects and providers.
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
The method provides high test-retest reliability and reproducibility, reducing the burden on subjects and healthcare providers, enabling early detection of impaired cone photoreceptor function, which can prevent or delay significant vision impairment associated with glaucoma.
Implementation Method 1
A method and apparatus for determining cone photoreceptor sensitivity are provided which utilizes a Maxwellian view optical system to present light stimuli to a subject
Implementation Method 2
The method utilizes a Maxwellian view optical system to present light stimuli to a subject in the form of a flashing stimulus superimposed on a steady background
Data Source
AI summary
The present disclosure describes an apparatus for testing to assess the cone photoreceptor pathway by determining the sensitivity of the cone photoreceptors. The test may be used to determine of a subject is suffering from, or is likely to suffer from, a disease state involving the fovea, parafovea, macula, neurological pathways used by these area to communicate with the visual processing centers in the brain and cone photoreceptors and/or ganglion cells. Using the novel cone photoreceptor sensitivity test and apparatus, the present disclosure shows that cone photoreceptor sensitivity in subjects with primary open angle glaucoma was decreased as compared to a control group (p=0.04). This cone photoreceptor sensitivity test is shown to have excellent repeatability, can be administered in a short time, does not require extensive subject instruction and meets other limitations required for application in a clinical setting.