Argyll Robertson pupils, or AR pupils, are a type of pupil found in people with neurological conditions such as neurosyphilis. They are characterized by constriction of the pupils in response to light, yet the pupils will dilate in response to accommodation. To check for AR pupils, a physician should begin by shining a bright light into the patient's eyes and observing the pupil size. If the pupils remain constricted, the physician should then move the light away and observe the pupil size again. If the pupils dilate, this can be indicative of AR pupils. Additionally, testing for other neurological conditions such as neurosyphilis can be useful in confirming a diagnosis of AR pupils.