Spontaneous cyclic segmental sphincter spasms in an Adie's tonic pupil

Area of Science:

• Ophthalmology
• Neuro-ophthalmology
• Autonomic Nervous System

Background:

• Adie's tonic pupil is a rare neurological disorder characterized by a delayed and sluggish pupillary light reflex.
• It is typically associated with damage to the postganglionic parasympathetic nerve fibers innervating the iris sphincter muscle.
• Bilateral involvement is uncommon, making this case particularly noteworthy.

Observation:

• A 43-year-old female patient presented with bilateral Adie's tonic pupils.
• A unique observation was a segment of the iris sphincter muscle in one eye exhibiting spontaneous, rhythmic contractions.
• These contractions occurred independently of light, near vision, or eye movements, suggesting an intrinsic myogenic or aberrant neural activity.

Findings:

• The spontaneous iris sphincter contractions were not elicited by standard pupillary testing (light, accommodation).
• This finding suggests a localized abnormality within the iris sphincter muscle itself or its intrinsic innervation.
• The precise mechanism underlying these spontaneous contractions in the context of Adie's tonic pupil remains unclear.

Implications:

• This case expands the clinical spectrum of Adie's tonic pupil, highlighting potential localized iris abnormalities.
• Further investigation into the pathophysiology of spontaneous iris sphincter activity could offer insights into pupillary இயக்கவியல் (pupillary இயக்கவியல்).
• Understanding such rare presentations is crucial for accurate diagnosis and management of neuro-ophthalmic disorders.