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The effect of age on the temporal summation of achromatic perimetric stimuli

Mulholland, Padraig J., Redmond, Tony, 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: 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: 23 Sep 2019 10:49
URI: http://orca.cf.ac.uk/id/eprint/78137

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