研究目的
To test the hypothesis that clinical statokinetic dissociation (SKD) in retinal disease is due to individual criterion bias and can be eliminated by equating psychophysical procedures for static and kinetic stimulus detection.
研究成果
Clinical SKD in retinal disease is not a true phenomenon but results from methodological differences and criterion bias in conventional perimetry. Using equated psychophysical procedures eliminates SKD, indicating it is not a useful marker for disease differentiation.
研究不足
The sample size was small and not homogeneous across disease stages; structural measurements at scotoma regions were not made; fixation instability was not directly measured, which could affect variability; and the study focused on retinal diseases, not cortical lesions.
1:Experimental Design and Method Selection:
The study used clinical perimetry (SAP and MKP) to identify regions of interest, followed by laboratory-based psychophysical methods including two-way Method of Limits (MoL) to define isocontrast regions, and Method of Constant Stimuli (MoCS) with a two-interval forced choice (2IFC) procedure to present stimuli and measure thresholds.
2:Sample Selection and Data Sources:
Six subjects with primary open-angle glaucoma and six with retinitis pigmentosa were recruited, with visual field defects confirmed through clinical examinations.
3:List of Experimental Equipment and Materials:
Equipment included a Humphrey Field Analyzer (HFA) for SAP, a laboratory setup with an iMac 27-inch computer running MATLAB and Psychtoolbox for stimulus presentation, a chin rest, trial frame with lenses, and a keyboard for responses.
4:Experimental Procedures and Operational Workflow:
Phase 1 involved clinical VF testing to determine regions of interest. Phase 2A used two-way MoL to measure inner and outer isopters. Phase 2B used MoCS and 2IFC to present static, inward-moving, and outward-moving stimuli at various eccentricities, with responses recorded to fit psychometric functions.
5:Data Analysis Methods:
Data were analyzed using sigmoidal nonlinear regression in GraphPad Prism to determine threshold eccentricities and slopes, with statistical comparisons using t-tests and ANOVA.
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Humphrey Field Analyzer
HFA
Carl Zeiss Meditec
Used for standard automated perimetry (SAP) to assess visual fields in subjects.
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Optical Coherence Tomography
Cirrus HD-OCT
Carl Zeiss Meditec
Used to measure structural changes in the retina and optic nerve head.
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Optical Coherence Tomography
Spectralis OCT
Heidelberg Engineering
Used to measure structural changes in the retina and optic nerve head.
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iMac
27-inch
Apple
Used to generate and present stimuli in the laboratory setup.
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MATLAB
version 7
MathWorks
Custom software for stimulus generation and data collection.
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Psychtoolbox
version 3.0.11
Used with MATLAB for psychophysical testing and stimulus presentation.
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GraphPad Prism
version 7
GraphPad Software
Used for statistical analysis and fitting psychometric functions.
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