Which type of nystagmus produces extremely minor tremors that are often undetectable?

Physiological nystagmus is characterized by minor, often undetectable tremors that occur as a natural response during the normal functioning of the visual and vestibular systems. This type of nystagmus can be seen in healthy individuals and may be induced by various activities such as following a moving object or due to changes in head position. It typically reflects the normal operation of the eye movement control systems, distinguishing it from pathological forms of nystagmus.

In contrast, other forms of nystagmus, such as caloric, horizontal gaze, and post-rotational nystagmus, are usually more prominent and can reveal underlying conditions or responses to specific stimuli, making them easier to observe. For instance, horizontal gaze nystagmus and post-rotational nystagmus can be exaggerated in individuals under the influence of intoxicants or after specific movements, leading to noticeable eye oscillations. Therefore, while physiological nystagmus may not be typically included in assessments for impairment, it serves as a reminder of the body’s normal, healthy functions.