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Rare express saccades in elderly fallers.

Q Yang¹, T T Lê, E Debay

¹Groupe IRIS Vision and Motricité Binoculaire, CNRS, Service d'Ophtalmologie-ORL-Stomatologie, Hôpital Européen Georges Pompidou, 20 rue Leblanc, 75908, Paris, France. yangqing165@hotmail.fr

Clinical Interventions in Aging

|March 14, 2009

Summary

This summary is machine-generated.

Elderly individuals with a history of falling exhibit a significant deficit in producing express saccades, a rapid eye movement crucial for visual processing. This deficiency may be linked to impaired cortical/subcortical networks, potentially increasing fall risk.

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Area of Science:

Neuroscience
Ophthalmology
Gerontology

Background:

Falls are a major health concern in the elderly population.
Optomotor reflexes, including saccades, are essential for maintaining balance and preventing falls.
Previous research has identified specific eye movement patterns associated with aging, but the role of express saccades in elderly fallers is less understood.

Purpose of the Study:

To investigate horizontal saccade characteristics in elderly individuals with a history of falls, specifically focusing on the generation of express saccades.
To compare saccade performance between elderly fallers and healthy elderly controls under different viewing conditions.

Main Methods:

Twelve elderly subjects with a history of falls and ten healthy elderly controls participated.
Horizontal saccades were recorded using the photoelectric IRIS system.
Two saccade paradigms, gap and overlap, were used at three viewing distances (20 cm, 40 cm, 150 cm).

Main Results:

Elderly fallers, similar to healthy controls, showed shorter saccade latencies in the gap paradigm compared to the overlap paradigm.
Saccade latencies were shorter at near viewing distances (20 cm, 40 cm) than at a far distance (150 cm) for both groups.
Crucially, elderly fallers demonstrated a significant deficit in producing express saccades, with most showing none or very low rates, unlike healthy controls.

Conclusions:

The scarcity of express saccades in elderly fallers suggests a potential disruption in the complex neural networks responsible for their generation.
This deficit in express saccades may indicate broader network dysfunctions, potentially contributing to impaired optomotor reflexes and an increased risk of falling.
The findings support the existence of specific neural networks for express saccades and highlight their importance in maintaining balance and preventing falls in older adults.