Speedy eye movements in multiple sclerosis: association with performance on visual and nonvisual cognitive tests

Area of Science:

• Ophthalmology
• Neurology
• Cognitive Science

Background:

• Eye movement abnormalities are prevalent in multiple sclerosis (MS).
• These oculomotor deficits can potentially impact cognitive test performance.
• Understanding these associations is crucial for comprehensive MS patient assessment.

Purpose of the Study:

• To investigate the relationship between speedy eye movement speed and cognitive function in individuals with MS.
• To evaluate a novel measure, the Speedy Eyes Test (SET), for assessing oculomotor performance.
• To compare eye movement speed between MS patients and healthy controls.

Main Methods:

• Experiment 1: 71 MS patients completed cognitive tests and the SET under timed conditions.
• Experiment 2: 60 MS patients and 31 healthy controls were assessed using an abbreviated SET.
• The SET measures purposeful, speedy eye movements.

Main Results:

• Slower eye movements on the SET were significantly correlated with poorer cognitive test performance in both experiments.
• Effect sizes for the association were large in Experiment 1 and medium in Experiment 2.
• MS patients demonstrated significantly slower eye movements compared to the healthy control group.

Conclusions:

• The Speedy Eyes Test (SET) is a brief, cost-effective, and non-technical tool.
• The SET shows potential as a visual/oculomotor indicator for cognitive impairment in multiple sclerosis.
• Further research is warranted to validate the SET's clinical utility.