Eye Movements - Eye Movements I Importance of Eye Movements...

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Eye Movements I. Importance of Eye Movements a. Direct fovea to object of interest b. Fixation = constant eye movement i. Stagnant eye – images fades ii. Adaption of photoreceptors – causes image to fade, cease to respond to unchanging stimulus. iii. Micromovement of eye: prevent adaption II. Types of Eye Movement a. Saccade i. Definition: quick darting movement that change point of fixation ii. Voluntary controlled by front eye field, supplemental eye field, and parietal eye field (visual attention) iii. Reflex controlled by superior colliculus 1. both visual and auditory input to SC to cause reflex 2. note: large reflex required (movement of head) SC also projects to cervical spinal cord via the tectospinal tract iv. Frontal Eye Field projects directly 1. superior colliculus (ipsilateral) 2. gaze centers (contralateral) 3. concerned with contralateral field of vision v. Primary voluntary eye movement b. Smooth Pursuit Movement i. Definition: tracking movements that keep a moving stimulus on
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Eye Movements - Eye Movements I Importance of Eye Movements...

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