Related Experiment Video
Updated: Jul 31, 2026
07:26
Assessing Pupil-linked Changes in Locus Coeruleus-mediated Arousal Elicited by Trigeminal Stimulation
Published on: November 26, 2019
The Argyll Robertson pupil
H Stanley Thompson1, Randy H Kardon
1Neuro-opthalmology Unit, Department of Opthalmology and Visual Sciences, University of Iowa Hospitals and Clinics, Iowa City, USA. thompson@ginniff.com
Summary
The Argyll Robertson pupil, characterized by light-near dissociation, may stem from peripheral nerve damage rather than a central midbrain lesion. Further examination is needed to pinpoint the exact cause of this specific pupillary abnormality.
Area of Science:
- Ophthalmology
- Neurology
Background:
- The Argyll Robertson (AR) pupil is defined by poor reaction to light and brisk constriction to near stimuli.
- Traditional understanding attributes the AR pupil to dorsal midbrain lesions, sparing the near reflex pathway.
Purpose of the Study:
- To investigate the underlying mechanism and precise localization of the syphilitic lesion causing the AR pupil.
- To differentiate AR pupil from tonic pupils seen in Adie syndrome and other neuropathic conditions.
Main Methods:
- Reviewing the diagnostic features of the AR pupil, including segmental iris sphincter constriction and tonic features.
- Comparing the clinical presentation of AR pupils with those of Adie syndrome and tonic pupils.
Main Results:
- The AR pupil typically lacks segmental iris sphincter constriction and tonic features, unlike typical tonic pupils.
- The traditional dorsal midbrain lesion theory for AR pupils is questioned due to lack of consistent evidence in syphilis.
Conclusions:
- The AR pupil's mechanism may involve peripheral denervation (ciliary ganglion or nerves) rather than a central midbrain lesion.
- Screening patients with bilateral tonic pupils for syphilis is recommended until the AR pupil's localization is definitively established.
