The Uppsala Contrast Sensitivity Test (UCST) - A fast strategy for clinical assessment of spectral contrast sensitivity
2014 (English)In: Ophthalmic Technologies XXIV, 2014, 89300H- p.Conference paper (Refereed)
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.
, Proceedings of SPIE, ISSN 0277-786X ; 8930
Spectral contrast sensitivity, Contrast sensitivity, CSF, CSF measurements, ophthalmology, med tech
Ophthalmology Radiology, Nuclear Medicine and Medical Imaging
IdentifiersURN: urn:nbn:se:uu:diva-228245DOI: 10.1117/12.2054403ISI: 000334350000011ISBN: 978-0-8194-9843-4OAI: oai:DiVA.org:uu-228245DiVA: diva2:733519
24th Conference on Ophthalmic Technologies as a part of the SPIE Photonics West BiOS Meeting, FEB 01-02, 2014, San Francisco, CA