Insertion of acupuncture needles into the sternocleidomastoid muscles of the neck may reduce nystagmus intensity in some individuals; (61) this can also improve the duration of foveation periods
, with the effects sometimes being sustained after treatment.
6) The duration of foveation periods has been thought of as a surrogate 'visual' measure of a waveform (discussed later).
When there is no stress attached to a task (for example no time constraint on performance), increasing visual demand does not increase nystagmus, (7) but may actually increase foveation periods.
28) developed an objective performance measure based on an individual's foveation periods called a nystagmus acuity function (NAF).