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.
The effect of age on the temporal summation of achromatic perimetric stimuli.
Investigative Ophthalmology and Visual Science
56
(11)
, pp. 6467-6472.
10.1167/iovs.15-16920
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Abstract
Purpose: To examine the temporal summation of a Goldmann III–sized stimulus under the conditions of standard automated perimetry in healthy participants of varying age. Methods: Twenty-seven healthy individuals of varying age (24–80 years) were tested. Achromatic contrast thresholds were measured for seven 0.48° diameter (near Goldmann III) spot stimuli of varying presentation duration (1–24 frames, 1.8–191.9 ms) at 8.8° eccentricity in the visual field along the 45°, 135°, 225°, and 315° meridians. All stimuli were displayed on a CRT display with a background set to 10 cd/m2. Iterative two-phase regression analysis was used to estimate the critical duration from each localized temporal summation function. Results: A significant decrease in contrast sensitivity for all stimulus durations examined in this study was observed with increasing age in both the superior and inferior hemifield (P < 0.001). Despite this, no significant change in the critical duration was observed as a function of age in either the superior (r2 = 9.1 × 10−9, P = 0.99) or inferior hemifield (r2 = 2.4 × 10−5, P = 0.98). Conclusions: Age-related changes in the visual system, although leading to a reduction in contrast sensitivity, are not accompanied by a change in temporal summation for a detection task with an achromatic 0.48° diameter spot stimulus. This is important to know when proceeding to examine temporal summation changes in diseases like glaucoma.
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Schools > Optometry and Vision Sciences |
| Subjects: | R Medicine > RE Ophthalmology |
| Publisher: | Association for Research in Vision and Ophthalmology |
| ISSN: | 0146-0404 |
| Date of First Compliant Deposit: | 22 September 2016 |
| Date of Acceptance: | 10 August 2015 |
| Last Modified: | 07 May 2023 20:34 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/78137 |
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