March 2012
Volume 53, Issue 14
ARVO Annual Meeting Abstract  |   March 2012
Dynamic Visual Function And Its Aging Effect
Author Affiliations & Notes
  • Kar Ho Siong
    The Hong Kong Polytechnic University (HKPU), Hong Kong, Hong Kong
  • H H. L. Chan
    The Hong Kong Polytechnic University (HKPU), Hong Kong, Hong Kong
  • A M. Y. Cheong
    The Hong Kong Polytechnic University (HKPU), Hong Kong, Hong Kong
  • Footnotes
    Commercial Relationships  Kar Ho Siong, None; H. H. L. Chan, None; A. M. Y. Cheong, None
  • Footnotes
    Support  The Hong Kong Polytechnic University Internal Grant - APJ67
Investigative Ophthalmology & Visual Science March 2012, Vol.53, 4819. doi:
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      Kar Ho Siong, H H. L. Chan, A M. Y. Cheong; Dynamic Visual Function And Its Aging Effect. Invest. Ophthalmol. Vis. Sci. 2012;53(14):4819.

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      © ARVO (1962-2015); The Authors (2016-present)

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Purpose: : Many real-world tasks consist of relative movement between observers and targets, evaluation of visual functions while targets and/or observers are in locomotion might better reflect individuals’ functional performances. In this study, we examined the impact of body motions on static and dynamic visual functions and their age-related changes.

Methods: : Forty-three subjects with normal vision were recruited and divided into three age groups, 17 in young (18-30 years), 12 in middle-age (31-55 years) and 14 in elderly (>56 years). Visual acuity (VA) and contrast sensitivity (CS) were measured when stimuli moved at 4 speeds (0, 30, 60 and 90 deg/second) and observers posed sitting, stepping and walking on treadmill. Subjects were required to identify isolated letter (H, O, T or V) or grating orientations (vertical, horizontal, right or left) in VA and CS task respectively. Targets were shown by Psykinematix on a 50-in LCD monitor.

Results: : Mixed between-within subjects ANOVA was used to study the impact of speeds, body postures and age on VA and CS. Increased stimuli’s speed significantly impeded VA and CS (p>0.10), reflecting little impact brought by locomotion. There was an aging effect on VA and CS (p<0.001). VA among three age groups was significantly different (p<0.001), but insignificant difference occurred between young and middle-age group in CS. Slope change in VA (-0.08 to -0.10) and CS (-0.14 to -0.20) among different speeds showed stronger age-related decline in CS. Interaction effect by body posture and age was insignificant in VA and CS; same result was also obtained when speed was considered. Significant interaction effect by speed and age was found in CS (p<0.001) but not in VA, indicating that moving speed affected older subjects’ CS more.

Conclusions: : Visual functions were significantly influenced by moving stimuli but not by observers’ locomotion. Both VA and CS deteriorated when targets moved till 60 deg/second. Stronger age-related decline with the effect of speed suggested further study on the correlation of dynamic vision with functional performance in daily activity (e.g. balancing), which involves more low-contrast stimuli.

Keywords: aging: visual performance • aging 

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