Which term describes involuntary eye movement?

Nystagmus is the term that describes involuntary eye movement. This condition often involves the eyes moving rapidly and uncontrollably, which can be side to side, up and down, or in circular motions. Nystagmus can be a response to various stimuli or result from underlying medical conditions, including those affecting the vestibular system responsible for balance and eye movement.

In the context of diving, understanding nystagmus is important because it can indicate certain physiological responses, such as reaction to changes in pressure or environment, which could affect a diver's ability to navigate or maintain focus underwater. Additionally, conditions like hypoxia—reduction in oxygen supply—or hypercapnia—elevated levels of carbon dioxide in the blood—can also lead to impacts on vision and coordination, but they do not specifically refer to the condition of involuntary eye movement itself.