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Graphical analysis of two-dimensional eye movements.

S Takemori, M Buas, J C Kattah

Auris, Nasus, Larynx

|January 1, 1986

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This study visualizes eye movements, including pursuit, saccades, and fixation, using a 2D plot. The graphical representation effectively distinguishes normal eye movements from pathological conditions like saccadic or ataxic disturbances.

Area of Science:

Ophthalmology and Neuroscience
Biomedical Engineering

Background:

Accurate measurement of eye movements is crucial for diagnosing neurological and ophthalmological disorders.
Traditional methods for recording eye movements have limitations in capturing complex trajectories.

Purpose of the Study:

To develop and validate a computer-controlled system for simultaneous, two-dimensional recording of horizontal and vertical monocular eye movements.
To analyze and differentiate normal and pathological eye movements (pursuit, saccades, fixation) using graphical plots.

Main Methods:

Utilized electronystagmography (silver plate electrodes) and magnetic search coil systems for data acquisition.
Implemented a computer-controlled testing system for simultaneous measurement of horizontal and vertical eye movements.

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Generated two-dimensional graphical plots of eye movement trajectories for analysis.

Main Results:

Normal pursuit movements exhibited smooth, snaky trajectories, not perfectly straight lines.
Saccades were characterized by quick jumps to target acquisition, followed by fixation movements around the target.
Pathological pursuit showed disturbances like smaller saccades and fixation; saccade disturbances included overshoot/undershoot; fixation failure presented as larger, irregular movements.

Conclusions:

Two-dimensional graphical plotting provides a clear and effective method for visualizing and differentiating normal and pathological monocular eye movements.
The developed system enhances the diagnostic capabilities for conditions affecting pursuit, saccades, and fixation.