The influence of age on the pattern and flash visual evoked magnetic response (VEMR)

Armstrong, Richard A., Slaven, A. and Harding, G.F. (1991). The influence of age on the pattern and flash visual evoked magnetic response (VEMR). Ophthalmic and Physiological Optics, 11 (1), pp. 71-75.

Abstract

The visual evoked magnetic response (VEMR) was measured over the occipital cortex to pattern and flash stimuli in 86 normal subjects aged 15-86 years. The latency of the major positive component (outgoing magnetic field) to the pattern reversal stimulus (P100M) increased with age, particularly after 55 years, while the amplitude of the P100M decreased more gradually over the lifespan. By contrast, the latency of the major positive component to the flash stimulus (P2M) increased more slowly with age after about 50 years, while its amplitude may have decreased in only a proportion of the elderly subjects. The changes in the P100M with age may reflect senile changes in the eye and optic nerve, e.g. senile miosis, degenerative changes in the retina or geniculostriate deficits. The P2M may be more susceptible to senile changes in the visual cortex. The data suggest that the contrast channels of visual information processing deteriorate more rapidly with age than the luminance channels.

Publication DOI: https://doi.org/10.1111/j.1475-1313.1991.tb00197.x
Divisions: Life & Health Sciences > Optometry
Life & Health Sciences > Ophthalmic Research Group
Life & Health Sciences
Uncontrolled Keywords: visual evoked magnetic response,VEMR,major positive component,age
Full Text Link: http://www3.interscience.wiley.com/journal/119353607/abstract
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Published Date: 1991-01
Authors: Armstrong, Richard A. ( 0000-0002-5046-3199)
Slaven, A.
Harding, G.F.

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