Central lesions | Peripheral lesions | |
---|---|---|
Duration of nystagmus | Persistent | Less than 60 s |
Onset of nystagmus | Immediate | Delay of 0–40 s |
Fatiguability of nystagmus | Non-fatiguable | Fatiguable |
Character of nystagmus | Variable | Fixed: torsional upwards towards the lower most ear |
Severity of symptoms | Mild (but marked nystagmus) | Severe vertigo with nausea. |