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KMID : 1036520120020020086
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Clinical Neuro-Ophthalmology
2012 Volume.2 No. 2 p.86 ~ p.95
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Ocular-Motor Test: Saccades, Smooth Pursuit, and Optokinetic System
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Choi Kwang-Dong
Choi Jae-Hwan
Kim Ji-Soo
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Abstract
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The study of eye movements is a scource of valuable information to both basic scientists and clinicians. Evaluation of the control of eye movements provides a unique opportunity to understand the workings of the brain and the clue to the localization of a disease process. Disorders of saccades consist of abnormalities of velocity, accuracy, initiation, and the presence of saccadic intrusions and oscillations. Saccadic disorders can be classified according to whether the saccadic pulse, the saccadic step, or the pulse-step match is inappropriate. Smooth pursuit can be quantified by measuring its onset and its maintenance. Step-ramp stimuli can be used to measure the onset of smooth pursuit, and during maintenance of smooth pursuit, gain is the most useful measurement. Bilaterally impaired pursuit is a nonspecific finding of many diffuse neurologic disorders, while unilateral impairement may suggest unilateral cerebral, brainstem, or cerebellar lesion.
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KEYWORD
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Ocular motor test, Saccades, Smooth pursuit, Optokinetic system
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