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The Uppsala Contrast Sensitivity Test (UCST) - A fast strategy for clinical assessment of spectral contrast sensitivity
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Neuroscience, Ophthalmology.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Neuroscience, Ophthalmology.
2014 (English)In: Ophthalmic Technologies XXIV, 2014, 89300H- p.Conference paper, Published paper (Refereed)
Abstract [en]

Routine clinical measurement of spectral contrast sensitivity is hampered by the time consumption of current methods. We are developing a system that allows instantaneous measurement of spectral contrast sensitivity. The UCST system consists of custom software running on an iPad connected to a calibrated TFT-monitor. Twenty healthy subjects were consecutively randomized to have their spectral contrast sensitivity measured with the UCST strategy or with a Vistech VCTS 6500 chart. The examination time and the spectral contrast sensitivity, respectively, were recorded for each eye in each subject. The Vistech strategy resulted in a more extended mean examination time (CI- Vistech: mu (0.95) = 87 +/- 27 s, d.f. = 9) than the UCST strategy (CI- UCST: mu (0.95) = 13 +/- 4 s, d.f. = 9), and the estimated mean difference between the two strategies indicated a difference in examination time (CI- difference: mu (0.95) = [47; 106] s, d.f. = 18). The overall contrast sensitivity for each group was estimated as the contrast sensitivities for the spatial frequencies sampled, integrated over the spatial frequency band sampled. The Vistech strategy resulted in a higher estimated mean overall contrast sensitivity (CI-Vistech: mu (0.95) = 116 +/- 24 log rel. log [c. deg(-1)], d.f. = 9) than the UCST strategy (CIUCST: mu (0.95) = 74 +/- 14 log rel. log [c. deg(-1)], d.f. = 9), and the estimated mean difference between the two strategies indicated a difference in overall contrast sensitivity (CI-difference: mu (0.95) = [15; 68] log rel. log [c. deg(-1)]), d.f. = 18). It is concluded that the UCST strategy measures spectral contrast sensitivity on the order of 7 times faster than the Vistech strategy. The slightly lower overall contrast sensitivity recorded for the UCST strategy appeared to be due to a limitation in dynamic range that can be overcome with improved design.

Place, publisher, year, edition, pages
2014. 89300H- p.
Series
Proceedings of SPIE, ISSN 0277-786X ; 8930
Keyword [en]
Spectral contrast sensitivity, Contrast sensitivity, CSF, CSF measurements, ophthalmology, med tech
National Category
Ophthalmology Radiology, Nuclear Medicine and Medical Imaging
Identifiers
URN: urn:nbn:se:uu:diva-228245DOI: 10.1117/12.2054403ISI: 000334350000011ISBN: 978-0-8194-9843-4 (print)OAI: oai:DiVA.org:uu-228245DiVA: diva2:733519
Conference
24th Conference on Ophthalmic Technologies as a part of the SPIE Photonics West BiOS Meeting, FEB 01-02, 2014, San Francisco, CA
Available from: 2014-07-10 Created: 2014-07-08 Last updated: 2017-01-25Bibliographically approved

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Malmqvist, Lars D.Söderberg, Per G.

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