Saccade is the term to describe rapid eye movements. I just want to be sure that saccading could be used as a verb, or if not, which term would you recommend using?
I would recommend twitch. Saccade is a noun with saccadic being the corresponding adjective. There is no prevalent verb form.
Example sentence from dicitonary:
He gets a twitch in his left eye when he's nervous.
Another term (admittedly rare even for medical professionals) is vellicate , basically meaning to twitch.
Wiktionary lists a verb form for saccade:
saccade (third-person singular simple present saccades, present participle saccading, simple past and past participle saccaded)
(of the eye) To make a rapid jerking movement to focus elsewhere.
However, in the academic literature on eye movements, saccade is almost always used as a noun. (For whatever reason, I have not encountered saccading and find it a little odd.) To use saccade as a verb in this literature, one often uses a verb phrase construction like make a saccade:
Subjects were instructed to fixate a central target and then make a saccade to one of three targets after hearing an acoustic stimulus. After making the saccade, another stimulus would sound indicating success on the trial.