Holmes-Adie Pupil (Tonic Pupil / Adie Syndrome)

Pathophysiology

The Adie pupil results from degeneration of the ciliary ganglion and its postganglionic parasympathetic fibers that normally constrict the pupil (via the sphincter pupillae) and control accommodation (via the ciliary muscle). The mechanism behind the characteristic "tonic" behaviour is aberrant reinnervation: accommodative fibres regenerate into pupilloconstrictor pathways, explaining why the near response is not truly "spared" but rather "restored." This also accounts for denervation supersensitivity to dilute cholinergic agents.

Kanski's Clinical Ophthalmology, p. 810
Adams and Victor's Principles of Neurology, 12th ed.
Localization in Clinical Neurology, 8th ed., p. 513

Clinical Features

Fig. 19.41A - Right Adie pupil: large, dilated right pupil vs normal left

Right Adie pupil - large pupil in ambient light

Fig. 19.41C - Right Adie pupil: consensual reflex testing

Right Adie pupil - consensual light reflex absent

Pupillary signs

Feature	Detail
Anisocoria	Affected pupil is larger in ambient/bright light
Direct light reflex	Absent or markedly reduced
Consensual light reflex	Also absent or reduced
Near (accommodation) response	Slow, tonic constriction - light-near dissociation
Redilation	Very slow after near effort - hallmark "tonic" feature
Vermiform movements	Worm-like irregular sphincter contractions at slit lamp
Segmental palsy	Sectors of the iris sphincter are paralysed - best seen with +10 lens
Chronic "little old Adie"	Over years, the pupil paradoxically becomes miotic as accommodation dysfunction resolves but sphincter paresis persists

Symptoms

Noticed anisocoria (incidental or cosmetic concern)
Blurred near vision / impaired accommodation
Photophobia

Demographics

Most common in young women, ages 20-40
~80% unilateral at onset; the second eye often becomes involved over months or years
May follow a viral illness or orbital/ocular surgery/trauma
Occasionally autosomal dominant inheritance

Holmes-Adie Syndrome

When the tonic pupil is accompanied by absent or depressed deep tendon reflexes (typically knee and ankle jerks), the complete picture is called Holmes-Adie syndrome. Additional autonomic features may coexist:

Ross syndrome: Adie pupil + areflexia + segmental anhidrosis (failure of sweating)
Orthostatic hypotension
Bladder/bowel dysfunction (rarely)

The reflex loss is thought to reflect a mild, mostly subclinical ganglionopathy affecting dorsal root ganglia.

Aetiology

Category	Examples
Idiopathic	Most common (Adie syndrome proper)
Viral/Infectious	VZV, HSV, CMV, Parvovirus B19, Campylobacter, Diphtheria, HTLV-2, Lyme disease
Orbital/Ocular	Surgery, trauma, panretinal photocoagulation
Autoimmune	Sjögren syndrome, GCA
Paraneoplastic	Small cell lung cancer (anti-Hu), seminoma, Lambert-Eaton syndrome
Other	Early syphilis, botulism, endometriosis, Riley-Day syndrome (in infants)

Pharmacological Testing

This is the definitive confirmatory test - it exploits denervation supersensitivity:

Instil 0.1-0.125% pilocarpine (dilute - sub-threshold for normal pupil) in both eyes
Recheck in 10-15 minutes
Adie pupil constricts; normal pupil does not

If the pupil does NOT constrict to 0.125% pilocarpine (e.g., pharmacologic dilation suspected), escalate to 1% pilocarpine - both pupils constrict, confirming a normal cholinergic pathway.

Note: Some diabetics can also show supersensitivity; rarely both normal pupils constrict.

Workup

Unilateral Adie pupil in an adult: no further lab testing is necessary if clinically typical
Bilateral simultaneous Adie pupils: send syphilis serology (RPR/VDRL + TPHA), screen for systemic autoimmune and paraneoplastic causes
Infant < 1 year: refer to paediatric neurology - rule out familial dysautonomia (Riley-Day syndrome)
Slit-lamp examination for vermiform movements and segmental iris sphincter paresis

Differential Diagnosis

Condition	Key distinguishing features
CN III palsy	Ptosis, exotropia, hypotropia; pupil may be involved; no cholinergic supersensitivity
Argyll Robertson pupil	Bilateral, very small (miotic) pupils; light-near dissociation; syphilis; no supersensitivity
Parinaud (dorsal midbrain) syndrome	Bilateral mid-dilated pupils; upgaze palsy, eyelid retraction (Collier sign), convergence-retraction nystagmus
Pharmacologic dilation	Large pupil, no response even to 1% pilocarpine
Physiologic anisocoria	Equal difference in dim and bright light, no reflex abnormality

Treatment & Follow-up

Pilocarpine 0.125% eye drops b.i.d. to q.i.d. - for cosmesis and to assist accommodation
No treatment reverses the underlying ganglion degeneration
Prognosis is benign for the isolated form
Reading glasses may help with near vision impairment
If the diagnosis is certain, routine follow-up is sufficient

Summary Memory Hook

"Adie" = Absent direct light reflex, Denervation supersensitivity (dilute pilocarpine), Iris vermiform movements, Enormous (dilated) pupil, women in their 20s-40s

Sources: Kanski's Clinical Ophthalmology 10th ed. | Wills Eye Manual | Adams & Victor's Principles of Neurology 12th ed. | Localization in Clinical Neurology 8th ed. | Rosen's Emergency Medicine

This is a shared conversation. Sign in to Orris to start your own chat.