Introduction

Angle-closure glaucoma is a potentially blinding condition that arises when the normal drainage of aqueous humour through the trabecular meshwork is obstructed by appositional or synechial closure of the anterior chamber angle. It may be classified as primary or secondary, with the latter resulting from an identifiable ocular or systemic pathology that alters the anterior segment anatomy or physiology. Among the secondary forms, mechanisms such as neovascularisation, uveitis, lens-induced changes, and structural anomalies are relatively common. However, rarer entities like Chandler’s syndrome, a variant of the iridocorneal endothelial (ICE) syndrome spectrum, pose unique diagnostic challenges.¹

Chandler’s syndrome is particularly important to recognise because its clinical manifestations often mimic other causes of secondary angle-closure glaucoma, yet its underlying pathophysiology, disease course, and management differ significantly. Failure to distinguish Chandler’s syndrome from more common etiologies may delay appropriate treatment and compromise visual prognosis. This article explores the key clinical features of Chandler’s syndrome and highlights how it can be differentiated from other causes of secondary angle-closure glaucoma to aid in timely and accurate diagnosis.

Understanding chandler’s syndrome

Chandler’s syndrome is one of the three clinical variants of iridocorneal endothelial (ICE) syndrome, the other two being essential (progressive) iris atrophy and Cogan-Reese syndrome. All three share a common pathophysiological basis, an abnormal proliferation and migration of corneal endothelial cells, which behave like epithelial cells and spread across the anterior chamber angle and iris. This leads to the formation of a contractile membrane that distorts normal anterior segment structures, ultimately resulting in secondary angle-closure glaucoma.

What makes Chandler’s syndrome distinct within the ICE spectrum is its predominant corneal involvement. Patients typically present with corneal oedema that is often out of proportion to the level of intraocular pressure (IOP). This occurs because the abnormal endothelial cells lose their pump function, impairing corneal deturgescence. Clinically, the endothelium may show a “beaten metal” appearance on slit-lamp examination, similar to that seen in corneal guttata but more irregular.²

Iris abnormalities such as atrophy, corectopia (eccentric pupil), or ectropion uveae are generally milder in Chandler’s syndrome compared to the other ICE variants, though peripheral anterior synechiae (PAS) and angle closure are common. The condition is characteristically unilateral and tends to occur in middle-aged women, though both genders can be affected.

Because the disease course is progressive and glaucoma can be refractory to treatment, early recognition of Chandler’s syndrome and differentiation from other secondary glaucomas is crucial for preserving vision.

Secondary angle-closure glaucoma: An overview

Secondary angle-closure glaucoma refers to glaucomas in which the closure of the anterior chamber angle occurs due to an identifiable underlying ocular or systemic condition. Unlike primary angle-closure, which is usually related to anatomical predispositions such as shallow anterior chambers or hyperopic eyes, secondary forms arise from disease processes that alter the normal anatomy or function of the anterior segment.

The mechanisms of secondary angle-closure can be broadly divided into:

• Pupillary block mechanisms, where the flow of aqueous humour from the posterior chamber to the anterior chamber is obstructed (e.g., phacomorphic glaucoma)
• Non-pupillary block mechanisms, where angle closure occurs due to structural or pathological changes such as synechiae, membrane formation, or neovascularisation

Common causes include:

• Neovascular glaucoma, often secondary to proliferative diabetic retinopathy or central retinal vein occlusion, is characterised by rubeosis iridis and fibrovascular membrane formation
• Uveitic glaucoma, where chronic or recurrent inflammation leads to posterior synechiae, peripheral anterior synechiae (PAS), and angle closure
• Lens-induced glaucomas, such as phacomorphic or phacolytic glaucoma, are caused by lens swelling or leakage of lens proteins
• Plateau iris configuration, in which the ciliary body pushes the peripheral iris forward, narrowing the angle
• Post-surgical or traumatic glaucoma, where structural changes or scarring compromise aqueous outflow

Each of these conditions can present with raised intraocular pressure (IOP), corneal oedema, and angle narrowing or closure. However, the underlying pathology, clinical signs, and associated systemic conditions vary, making careful evaluation essential for accurate diagnosis.³

Distinguishing features of chandler’s syndrome

Although Chandler’s syndrome shares several clinical manifestations with other causes of secondary angle-closure glaucoma, it exhibits a constellation of features that help set it apart. Recognition of these signs is essential to avoid misdiagnosis and guide appropriate management.

• Corneal Findings
  
  • The hallmark of Chandler’s syndrome is corneal oedema that appears disproportionate to intraocular pressure (IOP). Even with only moderately raised IOP, patients may show marked corneal clouding due to the endothelial pump dysfunction
  • On slit-lamp examination, the corneal endothelium may display a “beaten metal” or hammered-silver appearance, reflecting abnormal endothelial morphology
    
• Iris Changes
  
  • Unlike essential iris atrophy or Cogan-Reese syndrome, iris abnormalities in Chandler’s syndrome are usually subtle
  • Patients may show mild to moderate iris atrophy, corectopia (displaced pupil), or small iris holes, but these are generally less dramatic than in other ICE variants
    
• Angle Appearance
  
  • Broad-based peripheral anterior synechiae (PAS) are common, formed by contraction of the abnormal endothelial membrane that extends into the angle
  • Gonioscopy may reveal progressive angle narrowing, often with a membranous sheen
    
• Laterality and Demographics
  
  • Chandler’s syndrome is characteristically unilateral
  • It tends to present in middle-aged women, although men can also be affected
    
• Symptom Profile
  
  • Patients frequently complain of blurred vision and halos due to corneal oedema rather than pain, which may be more prominent in glaucomas with acute IOP spikes
    

Taken together, these features, particularly the combination of unilateral disease, disproportionate corneal oedema, mild iris changes, and synechial angle closure, help distinguish Chandler’s syndrome from other, more common causes of secondary angle-closure glaucoma.⁴

Key differences from other causes

Differentiating Chandler’s syndrome from other causes of secondary angle-closure glaucoma is critical, as the management and prognosis vary significantly. The following distinctions highlight how Chandler’s syndrome can be recognised in contrast to other conditions:

• Chandler’s Syndrome vs Neovascular Glaucoma
  • Chandler’s: Corneal oedema out of proportion to IOP; “beaten metal” endothelial changes; absence of neovascularisation
  • Neovascular glaucoma: Presence of rubeosis iridis, fibrovascular membranes, and a strong association with systemic conditions like diabetes or vein occlusion
    
• Chandler’s Syndrome vs Uveitic Glaucoma
  • Chandler’s: No active intraocular inflammation (no cells/flare in the anterior chamber). Iris atrophy is progressive but not associated with synechiae from inflammation
  • Uveitic glaucoma: Angle closure and synechiae develop secondary to chronic inflammation, often accompanied by keratic precipitates and anterior chamber reaction
    
• Chandler’s Syndrome vs Lens-Induced Glaucoma
  • Chandler’s: Normal lens position and size; corneal endothelial abnormalities are the key findings
  • Lens-induced glaucoma: Swollen or dislocated lens (phacomorphic) or leakage of lens proteins (phacolytic), without corneal endothelial membrane changes
    
• Chandler’s Syndrome vs Plateau Iris
  • Chandler’s: Peripheral anterior synechiae due to endothelial membrane contraction; gonioscopy shows endothelial changes
  • Plateau iris: Anatomical forward rotation of ciliary processes; no endothelial changes or iris membrane
    
• Chandler’s Syndrome vs Other ICE Variants
  • Chandler’s: Prominent corneal oedema, mild iris changes
  • Essential iris atrophy: Severe iris thinning, holes, and ectropion uveae
  • Cogan-Reese syndrome: Iris nodules or pigmented lesions, more pronounced iris involvement

Chandler’s syndrome is best distinguished by its unilateral presentation, striking corneal oedema with characteristic endothelial abnormalities, and relatively mild iris changes, features that are rarely seen together in other forms of secondary angle-closure glaucoma.⁵

Diagnostic approach

The diagnosis of Chandler’s syndrome requires careful clinical evaluation supported by imaging and laboratory tools to differentiate it from other causes of secondary angle-closure glaucoma. A systematic approach is essential, as misdiagnosis can delay appropriate treatment.

Clinical examination

• Slit-lamp biomicroscopy:
  • Reveals corneal oedema out of proportion to intraocular pressure
  • Endothelium may exhibit a “beaten metal” appearance
  • Mild iris atrophy, corectopia, or small iris holes may be visible
    
• Gonioscopy:
  • Detects broad-based peripheral anterior synechiae (PAS) caused by endothelial membrane contraction
  • Angle closure is usually progressive and often unilateral.

Imaging modalities

• Specular microscopy:
  • Demonstrates abnormal corneal endothelial cell morphology (pleomorphism and polymegathism)
  • Confirms the presence of endothelial dysfunction not seen in lens-related or inflammatory glaucomas
    
• Anterior Segment Optical Coherence Tomography (AS-OCT):
  • Provides cross-sectional imaging of the cornea and angle
  • Helps identify the synchial closure and the endothelial membrane extension
    
• Ultrasound Biomicroscopy (UBM):
  • Useful in evaluating iris configuration and detecting subtle membrane formation in the angle
    

Ancillary findings

• Intraocular pressure (IOP): Often moderately elevated, though corneal oedema may appear more severe than expected at that pressure
• Laterality: Disease is almost always unilateral, an important differentiator from systemic causes like neovascular glaucoma

Exclusion of other causes

• Neovascular glaucoma: Look for rubeosis iridis or retinal ischemia
• Uveitic glaucoma: Exclude active inflammation (cells/flare, keratic precipitates)
• Lens-induced glaucoma: Assess lens size, clarity, and position
  

Through this combination of slit-lamp findings, gonioscopy, endothelial imaging, and careful exclusion of alternative causes, clinicians can confidently diagnose Chandler’s syndrome and distinguish it from other secondary glaucomas.⁶

Management implications

Managing Chandler’s syndrome is often more challenging than treating other causes of secondary angle-closure glaucoma because both the corneal endothelium and the anterior chamber angle are progressively compromised. Therapy must therefore address intraocular pressure (IOP) control while preserving corneal clarity.

Medical therapy

• Topical IOP-lowering agents are the first line of treatment. Beta-blockers, carbonic anhydrase inhibitors, and alpha-agonists may be used
• Prostaglandin analogues can be considered, though some patients may not respond adequately
• Miotics (e.g., pilocarpine) are generally avoided as they may exacerbate angle closure by further narrowing the chamber angle
• Hypertonic saline drops or ointment may help alleviate corneal oedema temporarily, but do not address the underlying disease

Surgical management

• Filtering surgery (trabeculectomy): Often attempted when medical therapy fails. However, the abnormal endothelial membrane frequently grows over the surgical ostium, leading to early failure
• Glaucoma drainage devices (valves and shunts): Offer better long-term IOP control compared to trabeculectomy in Chandler’s syndrome
• Cyclodestructive procedures: Reserved for refractory cases with poor visual potential

Corneal considerations

• Progressive endothelial cell loss often results in persistent or worsening corneal oedema
• Endothelial keratoplasty (DSAEK or DMEK): May restore corneal clarity in advanced cases, but outcomes depend on IOP control and angle status
• Penetrating keratoplasty (PK): Considered if endothelial keratoplasty is not feasible or has failed

Prognosis compared to other secondary glaucomas

• Visual prognosis is guarded, as both glaucoma progression and corneal decompensation can compromise vision
• Compared with neovascular or uveitic glaucoma, Chandler’s syndrome progresses more insidiously but is equally difficult to manage long-term
• Early recognition, multimodal therapy, and careful monitoring are key to preserving vision.⁷

Summary

Chandler’s syndrome, a rare variant of the iridocorneal endothelial (ICE) spectrum, remains an important but often under-recognised cause of secondary angle-closure glaucoma. Its hallmark features, unilateral involvement, corneal oedema disproportionate to intraocular pressure, subtle iris changes, and broad peripheral anterior synechiae, help distinguish it from more common causes such as neovascular, uveitic, or lens-induced glaucomas. Accurate diagnosis relies on a combination of careful slit-lamp and gonioscopic examination, supplemented by imaging modalities like specular microscopy and anterior segment OCT.

Management poses unique challenges, as both intraocular pressure and corneal endothelial function must be addressed. While glaucoma drainage devices and keratoplasty can improve outcomes, long-term visual prognosis is often guarded. Early recognition and tailored treatment strategies are therefore essential to preserve vision. By differentiating Chandler’s syndrome from other secondary glaucomas, clinicians can optimise care and reduce the risk of irreversible blindness.