Argyll-Robertson pupil is one of the classic pupillary syndrome. It is sometimes seen in neurosyphilis. A mnemonic used for the Argyll-Robertson Pupil (ARP) is Accommodation Reflex Present (ARP) but Pupillary Reflex Absent (PRA)
Features
small, irregular pupils
no response to light but there is a response to accommodate
Causes
diabetes mellitus (most common now as neurosyphilis became so rare)