foveation period

foveation period

In congenital nystagmus it is the amount of time when the image of an object of regard is on or near the fovea and moving so slowly as to enable the patient to acquire useful visual information. The longer the foveation period and the lower the retinal image velocity, the higher the visual acuity.
References in periodicals archive ?
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).