Table 2.

Checklist of attributes for nystagmus characterization

Nystagmus Trajectory: axis or plane of rotation and direction in straight-ahead (center) gaze position including horizontal, vertical, and torsional components

Binocularity: monocular or binocular

Conjugacy: conjugate or disconjugate (dissociated or disjunctive)

Velocity: quantitative measurement of slow-phase velocity

Waveform: pendular or jerk

Frequency: most useful for low-frequency (<3 Hz) forms of pendular nystagmus

Intensity: qualitative assessment as product of amplitude and frequency

Eccentric gaze influence on presence or attributes of nystagmus including direction (from a head-referenced or eye-referenced coordinate system)

Effect of convergence

Influence of permitting versus blocking visual fixation

Effect of provocative maneuvers

Age of first appearance

Temporal profile: intermittent, continuous, or changing over time