Training in VNG

Performing saccade testing (VNG)

10 mins
25 November 2022


The saccade test (a test of the central vestibular system) assesses the patient's ability to move their eyes rapidly, from one focal point to another. As this is a random saccade test, the eye movements are reflexive rather than voluntary.

You can test in both horizontal and vertical directions. Abnormalities can include:
1) velocity of eye movements, either too slow or too fast
2) accuracy of eye movements, either overshooting or undershooting
3) latency of eye movements (reaction time), usually this is only a long latency as abnormally short latencies are most likely due to the patient anticipating the movement

The results can provide very specific site of lesion information. This video shows a horizontal saccade test being performed on a patient.


Leigh Martin
Leigh Martin is a British Audiologist and adjunct lecturer at the University of Cork, Ireland. Clinically, he has worked in the National Health Service specializing in paediatric audiology as well as vestibular diagnostics and rehabilitation. Leigh has also sat on the board of directors for the British Academy of Audiology. Since 2013, Leigh has supported the growth and development of the Interacoustics Academy and holds the position of Director of the Academy. Leigh has presented at numerous scientific conferences and meetings across a diverse range of audiological topics as well as having published papers in both video head impulse testing (vHIT) and wideband tympanometry.

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