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KMID : 1036520150050010008
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Clinical Neuro-Ophthalmology
2015 Volume.5 No. 1 p.8 ~ p.14
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Smooth Pursuit and Visual Fixation
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Lee Hak-Seung
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Abstract
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Smooth pursuit eye movements stabilize the image of an object on the fovea during slow movements of the object. 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. Motion sensitive visual area V5, middle temporal area (MT)/medial superior temporal area (MST), and frontal eye field are core structure for smooth pursuit. Additional structures such as pontine nuclei (dorsolateral pontine nuclei, DLPN; nucleus reticularis tegmenti pontis, NRTP), and cerebellum (especially flocculus, paraflucculus, dorsal vermis and fastigial nucleus) are also important role. Bilaterally impaired pursuit is a nonspecific finding of many diffuse neurologic disorders, while unilateral impairement may suggest unilateral cerebral, brainstem, or cerebellar lesion. Unlikely smooth pursuit, visual fixation enable us to focus our eyes on steady objects for clear vision. Rostral pole of superior colliculus and certain parietal lobe are critical role in maintenance of visual fixation.
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KEYWORD
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Smooth pursuit, Visual fixation
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