In nystagmus, what does the 'fast phase' refer to?

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Multiple Choice

In nystagmus, what does the 'fast phase' refer to?

Explanation:
The main idea is that nystagmus has two parts: a slow drift of the eye in the direction of the vestibular input, and a rapid corrective reset. The fast phase is that rapid, saccade-like movement that quickly brings the eye back toward center, and it happens in the opposite direction to the slow drift. This quick component is what defines the beat of the nystagmus. The other descriptions describe the slow drift, the direction of that drift, or a general fixation action, which don’t capture the rapid corrective movement.

The main idea is that nystagmus has two parts: a slow drift of the eye in the direction of the vestibular input, and a rapid corrective reset. The fast phase is that rapid, saccade-like movement that quickly brings the eye back toward center, and it happens in the opposite direction to the slow drift. This quick component is what defines the beat of the nystagmus. The other descriptions describe the slow drift, the direction of that drift, or a general fixation action, which don’t capture the rapid corrective movement.

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