What term is used to describe rapid, involuntary oscillating movements of the eyeball?

The term that describes rapid, involuntary oscillating movements of the eyeball is nystagmus. This condition can occur in various forms and can result from a variety of factors, including vestibular system disorders, drug or alcohol use, or certain neurological conditions. Nystagmus is characterized by a rhythmic back-and-forth motion and can affect vision, stability, and balance.

In contrast, strabismus refers to a misalignment of the eyes, where one eye may point straight ahead while the other turns inwards, outwards, upwards, or downwards. Diplopia is the medical term for double vision, where an individual sees two images of a single object. Accommodation involves the eye's ability to focus on near and far objects by adjusting the lens's curvature, a process that does not involve involuntary movement of the eyeballs. Thus, in the context of involuntary oscillation, nystagmus is the appropriate term.