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Timothy C. Hain, MD Page last modified: September 18, 2009

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A woman had a stroke found to be caused by a cavernoma of the left middle cerebellar peduncle. This subsequently underwent resection. One year later, she has chronic vertigo and a constant somewhat disjunctive nystagmus.

The following images illustrate her oculomotor testing. They are typical of a person with a severe cerebellar deficit.

saccadic dysmetria

Horizontal saccades exhibit overshoot dysmetria.


There is a severe disturbance of horizontal pursuit.

vertical saccades

Vertical saccades are generally unaffected by saccadic dysmetria.

Copyright January 30, 2019 , Timothy C. Hain, M.D. All rights reserved. Last saved on January 30, 2019