Effect of stimulus duration in flicker perimetry
| Autor: | Andrew J. Anderson, Algis J. Vingrys |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Adult
medicine.medical_specialty Time Factors Light genetic structures business.industry Flicker Stimulus onset asynchrony Flicker fusion threshold Audiology Stimulus (physiology) Luminance eye diseases Ophthalmology Optics Flicker perimetry Psychophysics Visual Perception Humans Visual Field Tests Medicine Visual Fields business |
| Zdroj: | Clinical and Experimental Ophthalmology. 28:223-226 |
| ISSN: | 1442-9071 1442-6404 |
| DOI: | 10.1046/j.1442-9071.2000.00299.x |
| Popis: | We investigated the relationship between stimulus duration and flicker thresholds when flickering stimuli were presented on luminance pedestals. Mean-modulated flicker thresholds remained constant with changes in stimulus duration. However, flicker presented on a luminance pedestal gave masking at short durations, decaying exponentially to stable thresholds with time. These stable thresholds were elevated when compared with the mean-modulated condition. The lowest threshold in a stimulus onset asynchrony function predicted the threshold obtained from a luminance-pedestal flicker stimulus of the same duration. This suggests that luminance-pedestal flicker thresholds are determined by the most detectable cycle in a multiple cycle stimulus. We find that the 800 ms stimulus duration used in the Medmont™ M600 perimeter (Medmont, Camberwell, Australia) is suitable to determine stable flicker thresholds. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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