Nystagmus 42 Questions And Answers

nystagmus is due to - ️️defects in eye muscle tonus: -from disorder of visual input, labyrinthine disease or CNS disease characteristics of ocular oscillation - ️️waveform: jerk (H or V), pendular (H or V, same frequency in both directions), rotary (torsional) amplitude (mm or degrees) frequency (cycles per sec) intensity = amplitude x frequency causes of nystagmus - ️️*infarction, injury, demyelination* also inflammation, infection, infiltration, inheritance, intoxication (end gaze), compression, degeneration, metabolic symptoms - ️️blur or double vision (smeared images) oscillopsia (feels like the world is shaking) peripheral vertigo central dizziness congenital nystagmus - ️️horizontal jerk or pendular at 1-4 months: large triangular wave forms then smaller amplitude higher frequency pendular waveforms btw 7-18 months: jerk waveforms