Definition

Noun: - An involuntary physiological response: The pupillary reflex is an automatic, rapid contraction of the iris sphincter muscle, triggered by exposure to increased light intensity, resulting in pupil constriction. It can also be initiated by the administration of certain drugs.

Usage

This term is used in medical, physiological, and optometric contexts to describe a specific, involuntary bodily response. - The doctor checked the patient's pupillary reflex by shining a penlight into each eye. - A sluggish or absent pupillary reflex can indicate neurological impairment.

Advanced Usage

• Clinical assessment: The pupillary reflex is a critical component of neurological examinations. It is often tested to assess brainstem function.
  • The paramedic's quick assessment of the pupillary reflex helped identify a potential head injury.
• Pharmacological testing: Certain substances, like opioids, can affect this reflex.
  • The constriction caused by the drug was consistent with a direct stimulation of the pupillary reflex.

Variants and Related Words

• Light reflex: A common synonym for the pupillary reflex.
• Pupillary light reflex (PLR): The full technical term.
• Miosis: The medical term for the condition of pupil constriction, which is the result of the pupillary reflex.
• Consensual pupillary reflex: The constriction of the pupil in one eye when the other eye is exposed to bright light.

Synonyms

• Light reflex
• Pupillary light reflex (PLR)

Related Phrases

• Test the pupillary reflex: To examine the reflex using a light source.
  • The nurse will now test your pupillary reflex.
• Abnormal pupillary reflex: A reflex that is not within normal parameters (e.g., too slow, absent, or unequal between eyes).
  • The scan was ordered due to an abnormal pupillary reflex.

Noun

1. reflex contraction of the sphincter muscle of the iris in response to a bright light (or certain drugs) causing the pupil to become smaller