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Contrast sensitivity functions measured using simple optics and computer testing.
Hammond, Billy R; Leathers, Taylor A; Wooten, Billy R; Renzi-Hammond, Lisa M.
Afiliación
  • Hammond BR; Vision Sciences Laboratory, Behavioral and Brain Sciences Program, Department of Psychology, University of Georgia, Athens, Georgia, USA.
  • Leathers TA; Department of Health Promotion and Behavior, Institute of Gerontology, University of Georgia, Athens, Georgia, USA.
  • Wooten BR; Department of Psychology, Brown University, Providence, Rhode Island, USA.
  • Renzi-Hammond LM; Department of Health Promotion and Behavior, Institute of Gerontology, University of Georgia, Athens, Georgia, USA.
Ophthalmic Physiol Opt ; 43(4): 898-904, 2023 07.
Article en En | MEDLINE | ID: mdl-37036657
PURPOSE: Contrast sensitivity function (CSF) testing is a common approach to assessing clinical changes to specific aspects of spatial vision. Different stimulus presentations and testing procedures, however, yield significant differences in CSF curves that are more a feature of the method than the observer. In this study, we designed a simple optical device for measuring CSF that could be directly calibrated and compared with a commonly used computer-based system. METHODS: Twenty-one participants (M = 28.95 ± 10.34 years; 66.7% female; 81.0% non-Hispanic White; best corrected visual acuity 6/9 or better) provided photopic CSFs (from measurements at 1.6, 3.2, 8, 16 and 24 cycles per degree, with spatial frequency presentation randomised) using both the Metropsis test platform and a simple optical device over two test sessions (one session/method, randomised, counterbalanced) separated by 1-7 days. The optical system used 520 nm lasers that were made Lambertian using two integrating spheres with a 3.5° circular exit port. These beams were combined with a beam splitter that allowed constant measurement of light output and contrast modulation using sine-wave gratings on glass. In Metropsis, 2° Gabor stimuli were presented for 0.5 s with either a vertical or a horizontal orientation via a two-alternative forced choice paradigm with contrast modulated until four (first) and eight (last) reversals were complete. RESULTS: Both methods took approximately the same amount of time to generate a CSF and yielded curves that were consistent with past studies using similar methods but different from each other. The optical system showed a 3.5 times higher maximum sensitivity and yielded higher test-retest reliability. CONCLUSIONS: Using simple optics to measure CSF yields low noise, high sensitivity and reliability. The ability to calibrate the stimuli directly is an advantage over computer-based methods.
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Texto completo: 1 Colección: 01-internacional Banco de datos: MEDLINE Asunto principal: Sensibilidad de Contraste / Visión de Colores Tipo de estudio: Clinical_trials / Diagnostic_studies Límite: Female / Humans / Male Idioma: En Revista: Ophthalmic Physiol Opt Año: 2023 Tipo del documento: Article País de afiliación: Estados Unidos

Texto completo: 1 Colección: 01-internacional Banco de datos: MEDLINE Asunto principal: Sensibilidad de Contraste / Visión de Colores Tipo de estudio: Clinical_trials / Diagnostic_studies Límite: Female / Humans / Male Idioma: En Revista: Ophthalmic Physiol Opt Año: 2023 Tipo del documento: Article País de afiliación: Estados Unidos