Saccades may rotate the eyes in any direction to relocate gaze direction (the direction of sight that corresponds to the fovea), but normally saccades do not rotate the eyes torsionally. (wikipedia.org)
Head-fixed saccades can have amplitudes of up to 90° (from one edge of the oculomotor range to the other), but in normal conditions saccades are far smaller, and any shift of gaze larger than about 20° is accompanied by a headmovement. (wikipedia.org)
During such gaze saccades, first, the eye produces a saccade to get gaze on target, whereas the head follows more slowly and the vestibulo-ocular reflex (VOR) causes the eyes to roll back in the head to keep gaze on the target. (wikipedia.org)
An understanding of gaze promotes the development of both saccades and pursuits that allow individuals to participate in their activities of daily life. (carrickinstitute.com)
Key structures involved in horizontal and vertical gaze allow the clinician to physiologically test specific areas of the integrated nervous system with direction towards clinical applications. (carrickinstitute.com)
Movements3
Saccades are one of the fastest movements produced by the human eye (blinks may reach even higher peak velocities). (wikipedia.org)
The high peak velocities and the main sequence relationship can also be used to distinguish micro-/saccades from other eye movements (like ocular tremor, ocular drift, and smooth pursuit). (wikipedia.org)
Aberrant abilities to stabilize the eyes associated with pathological saccades, pursuits and vestibular eye movements may be evaluated at the bedside. (carrickinstitute.com)
Eyes3
A saccade (/səˈkɑːd/ sə-KAHD, French for jerk) is a quick, simultaneous movement of both eyes between two or more phases of fixation in the same direction. (wikipedia.org)
Saccades can be categorized by intended goal in four ways: In a visually guided saccade, the eyes move toward a visual transient, or stimulus. (wikipedia.org)
Among disorders of binocular function, vergence insufficiency is the inability to converge or diverge the eyes smoothly and effectively to the object of interest and/or inability to maintain the vergence angle. (arvojournals.org)
Test2
A total of 19 students (20-27 years old) underwent ophthalmologic, orthoptic examination, and a vergence test coupled with video-oculography. (arvojournals.org)
Afterward the vergence test was repeated 1 week and 1 month later. (arvojournals.org)
Target2
Specific pre-target oscillatory (alpha rhythms) and transient activities occurring in posterior-lateral parietal cortex and occipital cortex also characterise express saccades. (wikipedia.org)
We used a novel Vergence double-step (Vd-s) protocol: the target stepped to a second position before the vergence movement completion. (arvojournals.org)
Amplitude3
Saccades to an unexpected stimulus normally take about 200 milliseconds (ms) to initiate, and then last from about 20-200 ms, depending on their amplitude (20-30 ms is typical in language reading). (wikipedia.org)
The amplitude of a saccade is the angular distance the eye travels during the movement. (wikipedia.org)
Systems with computer-generated stimuli locked to the acquisition of the responses allow for more sophisticated analysis (eg, latency, amplitude). (medscape.com)
Oculomotor2
Head-fixed saccades can have amplitudes of up to 90° (from one edge of the oculomotor range to the other), but in normal conditions saccades are far smaller, and any shift of gaze larger than about 20° is accompanied by a headmovement. (wikipedia.org)
Although these systems could provide gross evaluation of the various oculomotor subsystems, fine analysis of latency and accuracy of eye movements in response to the stimulus was not possible. (medscape.com)