Mulholland, Padraig J., Redmond, Tony  ORCID: https://orcid.org/0000-0002-6997-5231, Garway-Heath, David F., Zlatkova, Margarita B. and Anderson, Roger S.
2015.
Estimating the critical duration for temporal summation of standard achromatic perimetric stimuli.
Investigative Ophthalmology and Visual Science
56
(1)
, pp. 431-437.
10.1167/iovs.14-15304
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Abstract
Purpose: To estimate the critical duration of temporal summation for achromatic Goldmann III stimuli under the conditions of standard automated perimetry (SAP) and quantify response variability for short duration stimuli. Methods: Contrast thresholds were gathered using the method of constant stimuli for seven circular (0.48° diameter) incremental stimuli of varying duration (sum-of-frames equivalent: 8.3-198.3 msec), at an eccentricity of 8.8° along the four principal meridians of the visual field in two healthy, psychophysically experienced observers. Stimuli were presented on a high-resolution CRT display with a background luminance of 10 cd/m2. Psychometric functions were fitted using a probit model and non-parametric local linear analysis. The critical duration was estimated using iterative two-phase regression analysis, the results also being compared with values produced using previously published methods of analysis. Results: The median critical duration estimated using iterative two-phase regression analysis was 27.7 msec (IQR 22.5-29.8). A slight steepening of the psychometric function slope (lower variability) was observed for longer stimulus durations, using both probit and local-linear analysis techniques, but this was not statistically significant. Conclusions: Critical duration estimates in this study are substantially shorter than those previously reported for a Goldmann III stimulus under the conditions of SAP. Further work is required to firmly establish the relationship between measurement variability and the degree of local temporal and spatial summation.
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Schools > Optometry and Vision Sciences |
| Subjects: | R Medicine > RE Ophthalmology |
| Additional Information: | Published online: 16/12/14. |
| Publisher: | Association for Research in Vision and Ophthalmology |
| ISSN: | 0146-0404 |
| Date of First Compliant Deposit: | 22 September 2016 |
| Date of Acceptance: | 3 December 2014 |
| Last Modified: | 07 May 2023 20:35 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/68467 |
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