In jerk nystagmus, naming is based on the direction of which phase?

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Multiple Choice

In jerk nystagmus, naming is based on the direction of which phase?

Explanation:
In jerk nystagmus, naming is based on the direction of the fast phase. The eye drifts slowly in one direction (slow phase) due to an underlying imbalance, and then makes a rapid corrective move in the opposite direction (fast phase). The fast, quick reset is the defining feature used to label the movement. So if the rapid phase moves the eye to the right, it’s described as a right-beating jerk nystagmus. The slow drift and the amplitude don’t determine the name, only the direction of that fast corrective phase.

In jerk nystagmus, naming is based on the direction of the fast phase. The eye drifts slowly in one direction (slow phase) due to an underlying imbalance, and then makes a rapid corrective move in the opposite direction (fast phase). The fast, quick reset is the defining feature used to label the movement. So if the rapid phase moves the eye to the right, it’s described as a right-beating jerk nystagmus. The slow drift and the amplitude don’t determine the name, only the direction of that fast corrective phase.

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