Definition

Noun: A type of nystagmus (involuntary, rhythmic eye movement) that is induced by the physical rotation of the body. It is characterized by large, slow movements of the eyeballs in the same direction as the rotation.

Usage

This is a specialized medical term used primarily in neurology, otolaryngology (ENT), and vestibular science. It describes a specific physiological response to rotational stimuli. - It is typically observed and measured in clinical or research settings to assess the function of the vestibular system (the part of the inner ear and brain that helps control balance and eye movements). - The term is used to describe the eye movement itself, not the sensation of dizziness.

Examples

• The physician observed rotational nystagmus after spinning the patient in a rotary chair, indicating a normal vestibular response.
• In the laboratory, rotational nystagmus is a key metric for evaluating the vestibulo-ocular reflex.
• The presence of asymmetric rotational nystagmus can help diagnose a disorder in one of the inner ear's semicircular canals.

Advanced Usage

• Quantifying Rotational Nystagmus: In research, parameters like the slow-phase velocity, gain, and time constant of rotational nystagmus are analyzed to quantify vestibular function precisely.
• Rotational nystagmus can be contrasted with other types, such as (induced by changes in head position) or (induced by watching moving visual patterns).

Variants and Related Words

• Nystagmus (n): The broader category of involuntary eye oscillations, of which rotational nystagmus is one type.
• Vestibular nystagmus (n): A general term for nystagmus caused by stimulation of the vestibular system, which includes rotational nystagmus.
• Post-rotational nystagmus (n): The nystagmus that occurs a sustained rotation has stopped, which beats in the direction opposite to the original rotation.

Synonyms

• Rotary-induced nystagmus (This is a descriptive synonym, though "rotational nystagmus" is the standard clinical term.)
• Vestibulo-ocular response to rotation (A more descriptive phrase for the phenomenon.)

Related Phrases

• To elicit rotational nystagmus: To cause it to occur, usually for testing purposes.
  • The caloric test and the rotary chair test are two methods used to elicit rotational nystagmus.
• Direction of the slow phase: A key descriptor of the nystagmus, referring to the slow drift of the eyes.
  • In rotational nystagmus, the direction of the slow phase is the same as the direction of head rotation.

Noun

1. nystagmus caused by the body rotating rapidly; large slow movements of the eyeballs are in the direction of rotation