A comparison of three clinical methods of spatial contrast-sensitivity testing in normal subjects
| Autor: | Scott Tweten, Michael Wall, Barry D. Schwartz |
|---|---|
| Rok vydání: | 1990 |
| Předmět: |
Adult
business.industry media_common.quotation_subject Vision Tests Spatial contrast Sensory Systems High spatial frequency Contrast Sensitivity Cellular and Molecular Neuroscience Ophthalmology Optics Spectral sensitivity Chart Clinical Protocols Space Perception Photography Contrast (vision) Humans Spatial frequency Sensitivity (control systems) Visual angle business Biomedical engineering Mathematics media_common |
| Zdroj: | Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie. 228(1) |
| ISSN: | 0721-832X |
| Popis: | Three methods clinically used for measuring spatial contrast sensitivity were performed monocularly in normal subjects to compare their sensitivity and applicability. The methods tested were (1) the Von Bekesy tracking procedure, (2) the Method of Increasing Contrast, both carried out on a Nicolet CS-2000 automated Vision Tester, and (3) the Vistech Contrast Test System, a photographic test chart. The results show that the threshold sensitivities of the Von Bekesy tracking procedure and the Method of Increasing Contrast were not significantly different. For sensitivity to middle and high spatial frequency, the Vistech test chart was found to approximate the Method of Increasing Contrast. With automated testing, a slower rate of contrast progression and a larger visual angle produced lower thresholds of detection of the contrast-sensitivity function. Using a slow rate of contrast progression, both the Vistech test chart and the Method of Increasing Contrast were rapidly conducted, easy to administer, and gave good approximations of the spatial contrast-sensitivity function. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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