_______________ is an advanced form of ocular flutter that appears as an almost constant series of involuntary conjugate saccades.

• A. Nystagmus
• B. Opsoclonus
• C. Oscillopsia
• D. Oculopalatal myoclonus

Answer: (B)

Opsoclonus is an advanced form of ocular flutter, seen as an almost constant, rapid series of conjugate saccades in multiple directions with little to no intersaccadic interval. The key here is that the eye movements are fast, jumpy bursts that occur in several directions, so gaze cannot be held steady. Ocular flutter alone tends to be rapid saccades in a single plane, not multi-directional. Nystagmus involves a slow drift with a corrective fast phase, not a continuous barrage of saccades. Oscillopsia is the subjective sensation of movement in the environment rather than a specific pattern of eye movements. Oculopalatal myoclonus is a slower, rhythmic tremor with palatal involvement, not rapid multi-directional saccadic bursts. Therefore, the description fits opsoclonus.